Computer Applications – SESSION 20-VIRUS & SAFETY

DENTAL NTA LEVEL 4 • STUDY NOTES

Computer Applications – SESSION 20-VIRUS & SAFETY

Read the complete lesson in an organized slide-by-slide format. This topic contains 24 learning sections from the source presentation.

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LESSON CONTENTS — 24 SECTIONS
01  COMPUTER SAFETY: VIRUS, AND PROTECTION02  LEARNING OBJECTIVE03  KEEPING YOUR COMPUTER RUNNING AT PEAK PERFORMANCE04  KEEPING YOUR COMPUTER RUNNING AT PEAK PERFORMANCE CONT’….05  KEEPING YOUR COMPUTER RUNNING AT PEAK PERFORMANCE CONT’….06  KEEPING YOUR COMPUTER RUNNING AT PEAK PERFORMANCE CONT’….07  KEEPING YOUR COMPUTER RUNNING AT PEAK PERFORMANCE CONT’….08  TIPS FOR KEEPING YOUR COMPUTER RUNNING SMOOTHLY CONT’09  TIPS FOR KEEPING YOUR COMPUTER RUNNING SMOOTHLY10  TIPS FOR KEEPING YOUR COMPUTER RUNNING SMOOTHLY CONT’….11  TIPS FOR KEEPING YOUR COMPUTER RUNNING SMOOTHLY CONT’….12  TIPS FOR KEEPING YOUR COMPUTER RUNNING SMOOTHLY CONT’….13  HOW TO REMOVE SPYWARE / ADWARE OR VIRUSES14  HOW TO REMOVE SPYWARE / ADWARE OR VIRUSES CONT’…15  HOW TO REMOVE SPYWARE / ADWARE OR VIRUSES CONT’…16  HOW TO REMOVE SPYWARE / ADWARE OR VIRUSES CONT’…17  HOW TO REMOVE SPYWARE / ADWARE OR VIRUSES CONT’…18  REMOVING A VIRUS19  REMOVING A VIRUS CONT’…20  REMOVING A VIRUS CONT’…21  REMOVING A VIRUS CONT’…22  REMOVING A VIRUS CONT’…23  SYMPTOMS OF VIRUS ATTACK24  TYPES OF COMPUTER VIRUS
LEARNING SECTION 1CONTENTS ↑

COMPUTER SAFETY: VIRUS, AND PROTECTION

Visual learning slide. No additional extractable text was available.
LEARNING SECTION 2CONTENTS ↑

LEARNING OBJECTIVE

Learning Objectives

  • Explain How to Keep Computer Running at Peak Performance
  • Explain on How to Remove Spyware / Adware or Virus
LEARNING SECTION 3CONTENTS ↑

KEEPING YOUR COMPUTER RUNNING AT PEAK PERFORMANCE

With the amount of information available for download on the internet, it’s easy to quickly fill up your valuable hard drive space and turn your computer into a sluggish, unresponsive monster.

Keeping your hard drive clean is essential to the high performance that the latest computers can achieve.

LEARNING SECTION 4CONTENTS ↑

KEEPING YOUR COMPUTER RUNNING AT PEAK PERFORMANCE CONT’….

Fortunately, it’s a simple process; one that can easily be performed on a regular basis and, with some organization, keeps your computer running like a well-oiled machine.

You can discover how much hard drive space is available on your computer by accessing the DriveSpace program in your System Tools.

A pie graph will show you the amount of used and unused space for each of your drives.

Check this often to keep an idea of how much space you are using.

LEARNING SECTION 5CONTENTS ↑

KEEPING YOUR COMPUTER RUNNING AT PEAK PERFORMANCE CONT’….

STEPS TO CLEARING UP YOUR HARD DRIVE

Uninstall unused programs

Many times a new program will come along that looks fun to have or play with, but after a week or two you simply stop using it.

Clean out temporary files

When your computer is not shut down properly, it will pass information from memory into fragmented files.

Also, while you are running programs, your computer will write information that it does not immediately need into temporary files

LEARNING SECTION 6CONTENTS ↑

KEEPING YOUR COMPUTER RUNNING AT PEAK PERFORMANCE CONT’….

Empty your internet cache

As you surf the internet your computer stores web pages and images into a temporary internet cache so that it can quickly recall and access information when you move back and forth between pages.

Empty your mail programs of clutter

It’s easy to browse through your email and leave old messages there, promising yourself you’ll sort them out later.

One or two messages don’t take up much space, but hundreds certainly do

LEARNING SECTION 7CONTENTS ↑

KEEPING YOUR COMPUTER RUNNING AT PEAK PERFORMANCE CONT’….

Empty your recycle bin

Once you’ve emptied your drive of cluttering, unnecessary programs; empty your recycle bin to remove what has been placed there in the process.

Scandisk and Defrag

When Windows installs programs, it will put the files it needs anywhere that it finds free space, and not directly after the last program installed.

As a result, your hard drive has patches of empty space on it that are not big enough to fit a full program, and will result in a drive space error if you attempt to install something new.

LEARNING SECTION 8CONTENTS ↑

TIPS FOR KEEPING YOUR COMPUTER RUNNING SMOOTHLY CONT’

Do not let a lot of programs load up when you start your computer.

They use valuable memory and Windows Resources (Windows internal workspace). All programs in your Windows System Tray (in the lower left of your screen) are running on your computer.

Close them if you don’t need them or run them and configure them not to load when you boot up. Other programs running in the background can be found by pressing Ctrl + Alt + Delete at the same time.

LEARNING SECTION 9CONTENTS ↑

TIPS FOR KEEPING YOUR COMPUTER RUNNING SMOOTHLY

Never turn your computer off with the power switch until Windows has shut down.

This rule prevents permanent Hard Disk (HD) defects caused by the hard drive heads contacting the surface of the drive disc and can also result in lost data or Windows files.

The one exception to this rule is when your computer locks up and HD is not running (HD light is not blinking).

Recover from crashes by pressing the Ctrl + Alt + Delete keys at the same time.

Press them again to reboot your computer

LEARNING SECTION 10CONTENTS ↑

TIPS FOR KEEPING YOUR COMPUTER RUNNING SMOOTHLY CONT’….

Use UPS (uninterruptable power supply) for your computer.

This will keep your computer from crashing during power outages, and will protect your computer from low and high voltage occurrences.

Run Scandisk and Defragment at least once a month to keep your HD healthy and prevent crashes.

LEARNING SECTION 11CONTENTS ↑

TIPS FOR KEEPING YOUR COMPUTER RUNNING SMOOTHLY CONT’….

Do use a virus checker regularly.

The best type of protection is continuous monitoring from a dedicated anti-virus program like Norton Antivirus.

If you have a high speed Internet connection you need a firewall program.

A firewall program keeps those who want to hijack your computer from gaining access to your system.

You really do not want someone else running your computer.

LEARNING SECTION 12CONTENTS ↑

TIPS FOR KEEPING YOUR COMPUTER RUNNING SMOOTHLY CONT’….

Keep track of the software disks you receive with your computer and new peripherals

These disks contain valuable software drivers and programs for Windows and are needed when Windows must be reloaded.

Keep these disks and your Windows software disks in a safe, dry, place — you never know when you will need them.

LEARNING SECTION 13CONTENTS ↑

HOW TO REMOVE SPYWARE / ADWARE OR VIRUSES

Spyware/Adware these are illegal programs which come onto your computer usually while browsing the internet.

This software will mostly slow your computer down and also some times report your actions and files to the programmer.

When a computer is infected with spyware/adware, it will become a little slower and you will be getting a lot of pop-ups while browsing the internet.

These pop-ups can be ads or false computer warning.

LEARNING SECTION 14CONTENTS ↑

HOW TO REMOVE SPYWARE / ADWARE OR VIRUSES CONT’…

In order to remove spyware/adware you require some special removal software.

One example of this software is ad-aware by Lavasoft which can be downloaded for free from www.lavasoft.com.

Once you have downloaded and installed ad-aware you will see the following screen bellow.

LEARNING SECTION 15CONTENTS ↑

HOW TO REMOVE SPYWARE / ADWARE OR VIRUSES CONT’…

Figure 1: Ad –Aware Software View

LEARNING SECTION 16CONTENTS ↑

HOW TO REMOVE SPYWARE / ADWARE OR VIRUSES CONT’…

Click on start to scan the computer for Adware.

And select the default settings and click next. Once the scan is complete, you can see as shown in the picture bellow that your computer has 9 New Critical objects

Click next and select the objects you would like to remove (Usually just select all).

LEARNING SECTION 17CONTENTS ↑

HOW TO REMOVE SPYWARE / ADWARE OR VIRUSES CONT’…

Figure 2: Show Completed Scanned Object

Please note that it is important you update you ad-aware program and before scanning for adware on you system.

In order to update your ad definitions click on the globe on the top right

LEARNING SECTION 18CONTENTS ↑

REMOVING A VIRUS

Virus is illegal program designed to corrupt your computers files and there for eventually either slow or crash your system.

With the help of virus removal software such as Norton, AVG and MacAfee antivirus software you can mostly find and remove viruses from a machine.

AVG is free antivirus software.

LEARNING SECTION 19CONTENTS ↑

REMOVING A VIRUS CONT’…

It is important you make sure you update your antivirus software regularly to make sure your virus software is aware of the latest virus threats and there for can protect your computer from them.

In IFM we have been using Norton System works to protect our computers from viruses and maintaining our computer.

Click Start  All Programs  Norton System Works  Norton System Works

LEARNING SECTION 20CONTENTS ↑

REMOVING A VIRUS CONT’…

Figure 3: Norton System dialog box

LEARNING SECTION 21CONTENTS ↑

REMOVING A VIRUS CONT’…

Click Norton Antivirus  Scan for Viruses  Scan drives

Figure 4: Scan for Virus

Select the drives you would like to scan and click scan.

LEARNING SECTION 22CONTENTS ↑

REMOVING A VIRUS CONT’…

Figure 5: Selected Drives for Scanning

Once you have scanned follow the instructions, provided.

If you require more help you can always use Norton help.

LEARNING SECTION 23CONTENTS ↑

SYMPTOMS OF VIRUS ATTACK

Computer runs slower than usual

Computer no longer boots up

Screen sometimes flicker

PC speaker beeps periodically

System crashes for no reason

Files/directories sometimes disappear

Denial of Service (DoS)

LEARNING SECTION 24CONTENTS ↑

TYPES OF COMPUTER VIRUS

Time Bomb

Logical Bomb

Worm

Boot Sector Virus

Macros Virus

Script Virus

Trojan Horse

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