1. Computer virus Topic: Prepared For Salmeen Rahman Prepared By
MD ISMAIL HOSSAIN AMINUR
BBA-A #
Computer virus

2. Definition of virus:
A computer virus is a small software program that spreads from one computer to another, and interferes with computer operation.

3. Types of virus Resident Viruses Worms viruses Direct Action Viruses
Overwrite Viruses
Boot Virus
Macro Virus
Directory Virus
Polymorphic Virus
Network Virus
FAT Virus

4. How to spread virus: Through attachments Through email messages
Through funny images, greeting cards
Through audio and video files.
Through downloads on the Internet
And the Common methods for spreading viruses include floppy disks, FTP file transfers, and copying files between shared network drives.

5. Computer Virus Symptoms
1.Hardware Troubles
2.Slow Performance
3.Slow Startup
4.Crashing
5.Missing files
6.Unusual Error Messages

6. How I can help protect my computer from viruses
1.Install an update antivirus program:
2.Don't open messages from unfamiliar senders, or attachments that you don't recognize
3.Use a pop-up blocker with your browser
4. Keep Windows updated
5. Use a firewall
6. Use your browser's privacy settings
7. Clear your Internet cache and your browsing history
8. Scan any or files downloaded from the Internet before you open them

7. Antivirus software
Many users install antivirus software that can detect and eliminate known viruses when the computer attempts to download or run the executable

8. Recovery strategies and methods
One can also reduce the damage done by viruses by making regular backups of data on different media, that are either kept unconnected to the system read-only or not accessible for other reasons, such as using different file systems. This way, if data is lost through a virus, one can start again using the backup

9. Virus removal
Many websites run by antivirus software companies provide free online virus scanning, with limited cleaning facilities . Some websites—like Google subsidiary VirusTotal.com—allow users to upload one or more suspicious files to be scanned and checked by one or more antivirus programs in one operation.