What is Computer Virus?
Virus is a program or a programming code, which creates itself copy again and again after every restart or opening and closing files. Virus starts coding in the computer without the permission of owner. It creates multiple copies at minimal times, and it makes slower the system and start execution of bad codes in the system.

Types of Virus 2009
1.    Amiga Virus – Amiga Virus is one of the download viruses. It starts virus download automatically to the system.

2.    Blended Threats – Blended Threats is one of the common virus, which come from downloads and blended threats is the combination of Trojans, worms virus.

3.    Linux & UNIX Virus – Linux & UNIX Virus infect to Linux system and UNIX system. It is the multiple program viruses, which break the security of system.

4.    Macintosh Virus – Macintosh Virus infect to Macintosh computers.

5.    Micro Virus – Macro Virus is the multiple programs.

6.    Wireless Threats – Wireless threats connect call to other numbers without permission.

List of Virus Names or List of Bad Virus for Computer
1.   autorun.inf virus – autorun.inf virus is the auto run virus, when you insert any disk, CD, DVD, floppy, pen drive and other peripheral gadgets then this virus starts performing their work and you do not get single second to detect it.

2.    backdoor virus – backdoor virus is the form of Trojan horse virus. Backdoor virus executes its multiple codes and program automatically many times in hour. It makes slower the speed of system or computer.

3.    bagle virus - bagle virus executes malicious code to the infected system. This bagle virus mass mailing virus. Bagle virus is spreading in the whole world day by day.

4.    blaster virus – blaster virus is also called Lovsan or Lovesan virus. This is worm blaster virus. Blaster virus spread over the internet market place. Blaster virus can badly infect to your computer.

5.    confiker virus – confiker virus is one of the latest windows threats virus. It is one of the worst viruses of computer. Confiker virus increases its execution again and again. confiker virus had effected millions of internet users.

6.    conflicter virus – conflicter virus is the popular virus for destroying computer. Save your computer from conflicter virus. conflicter virus download without permission of your firewall or antivirus.

7.    iexplore.exe virus – iexplore.exe virus come from internet market places. iexplore.exe virus can easily affect to your system. Save your pc from iexplore.exe virus.

8.    internet virus – internet virus come in your pc while searching or working with internet. There are also many sites; those get infected by these viruses and at the time of opening the site. It starts destroying the site. It also install in the system of that person, who has open infected site.

9.    lsass.exe virus – lsass.exe virus is system file virus. lsass.exe virus come from spyware virus. lsass.exe virus give unusual error in the system again and again.

10.    malware virus – malware virus is dangerous virus for system. malware virus start downloading its files without persmission of system administration. malware virus do not detect by free antivirus. Antivirus should be very powerful for detection of malware virus.

11.    mydoom virus – mydoom virus is email virus. mydoom virus usually come from unauthorized email ids.

12.   rundll32.exe virus – rundll32.exe virus is bad virus for system files. rundll32.exe virus causes de-allocation of memory and detection of dlls File. rundll32.exe virus is form of spyware, Trojan and malware virus.

13.    sasser virus – sasser virus is bad virus of network system. sasser virus creates exe file and destroy your network.

14.    spyware virus - spyware virus is one of the dangerous virus for our system. spyware virus come from different types of download from system. Do not download anything over the internet until or unless you do not believe on the site.

15.    trojan virus – trojan virus is very popular virus in online and offline market places. trojan virus start destroying your documents and create one and more files at the time of working in any file. trojan virus move from one system to other system.

16.   svchost.exe virus – svchost.exe virus find your network and start destroying your network.

17.    trojan horse virus – trojan horse virus is famous virus. trojan horse virus destroy your documents and files. It comes from downloading or execution of internet files.

18.    svchost virus – svchost virus is bad virus for LAN, WAN and other networks.

19.    agobot virus – agobot virus is also called IRC controlled backdoor virus. agobot virus is affect to backdoor of your system.

20.    dll virus – dll virus execute in your system32 folder and creates harm to your all files of system. dll virus make slower the speed of system.

List of Anti Virus 2009 and Best Anti Virus of the World 2009

1.    Avira AntiVirus Personal and Professional
2.    AOL Active Virus
3.    Avast Anti Virus Home Edition and Professional Edition
4.    AVG Anti-Virus
5.    Kaspersky AVZ Anti Virus
6.    BitDefender Anti Virus
7.    BitDefender Anti Virus
8.    BullGuard Anti Virus
9.    Clam AntiVirus
10.    CA Anti-Virus
11.    Comodo AntiVirus
12.    Fortinet FortiClient Anti Virus
13.    F-Prot Anti Virus
14.    F-Secure Anti Virus
15.    G DATA Anti Virus
16.    Kaspersky Anti-Virus
17.    McAfee VirusScan
18.    NOD32 Anti Virus
19.    Norman ASA Anti Virus
20.    Norton AntiVirus
21.    Panda Antivirus
22.    Panda Cloud Antivirus
23.    PC Tools AntiVirus
24.    PC Tools AntiVirus
25.    Sophos Anti-Virus
26.    Vba32Antivirus
27.    VIPRE Antivirus
28.    VirusBuster Anti Virus
29.    ZoneAlarm Antivirus

Top 10 Anti Viruses of the World or Best Anti Virus of World 2009 or 2009 Anti Virus

1.    Shield Deluxe 2009
2.    Trend Micro Antivirus Internet Security 2009
3.    Avira AntiVirus
4.    Norton Antivirus 2009
5.    Panda Antivirus Pro 2009
6.    AVG Anti Virus
7.    ZoneAlarm Anti-virus 2009
8.    ESET NOD32 Antivirus
9.    McAfee Anti Virus
10.    Kaspersky Anti-Virus

Free Edition Antivirus or Best Free Anti Virus 2009 or 2009 Free Anti Viruses

1.    Avira Free Edition Anti Virus
2.    AVG Free Edition Anti Virus
3.    Avast Free Edition Anti Virus
4.    BitDefender Free Edition Anti Virus
5.    Clam AV Free Edition Anti Virus
6.    Comodo Anti-Virus Free Edition Anti Virus
7.    ClamWin Free Edition Anti Virus
8.    HandyBits Free Edition Anti Virus
9.    ThreatExpert Free Edition Anti Virus
10.    PC Tools Free Edition Anti Virus
11.    ThreatFire Free Edition Anti Virus

2009 Free Online Virus Scanners or Free Online Virus Scanners 2009 or Virus Scanner Online 2009

1.    PC Pitstop
2.    TrendMicro HouseCall
3.    VirusTotal
4.    GFI online
5.    Trojan Scanner
6.    McAfee’s
7.    Virusscan Online