4 powerful and free antivirus programs

You shouldn't spend too much on antivirus programs while there are good free programs and I introduce some of them:
NanoScan
www.nanoscan.com
This program can analyze all the running programs  and find all trojans and viruses then delete them within  a minute.

ThreatFire Antivirus
www.threatfire.com
This program can discover viruses by their behavior not by the older ways and its results are accurate.

Avira Antivir Personal Edition 
www.free-av.com
This a good protection program that can provide a reasonable level of security and can work with other protection programs.

Hijack This
www.trendsecure.com
You should follow some steps to activate this program. It's a free program which enables its user to receive technical support from specialists to help him get rid of any malware program.

What is the best antivirus program?

This question make you hesitate to choose an antivirus program for your PC. Just read the following:
1.Highest detection of malicious programs:
Antivirus pro. / detection rate

1. kaspersky / 97.89%
2. Symantec(Norton) / 96.83%
3. McAfee / 91.63%
4. Trend Micro / 87%
5. Microsoft / 82%
   

source: AV comparatives

2.Fastest response time:
Antivirus pro. / Time in hours

1.  Kspersky /0.20
2. Sophos / 2.30
3. Trend Micro / 4.25
4. McAfee / 8.20
5. Symantec / 9.50

3.System resources required :

1. Kaspersky  / 6%
2. McAfee / 29%
3. Symantec / 30% 
4. CA / 33%
5. Bit Defender / 44%

Source: cent 2007 Anti-virus performance test scores
4.Monthly automated updates:
Antivirus pro. / updates per month

1. Kaspersky / 600
2. Sophos / 62
3. Symantec / 32
4. McAfee / 30
5. CA / 27
6. Trend Micro /18

Source:Vendor Data
5.Percentage of successfully disinfected files:

1. Kaspersky / 87.50%
2. Symantec  / 83.33%
3. Bit Defender / 75%
4. Panda / 70.83%
5. AVG / 25%
6. NOD 32 / 12% 

Source:ComputerBild Magazine
6.Heuristic Scanning:

1. Kaspersky / 48%
2. Sophos / 34%
3. McAfee / 30%
4. Trend Micro / 15%
5. Symantec / 14%

Source: AV Comparatives

7.Recovery from active infections:

1. Kaspersky / 86%
2. Symantec / 82%
3. AVG / 82%
4. Avast / 77%
5. Trend Micro / 77%

Source:AV Test.org
8.Detection of active root kits:

1. Kaspersky / 100%
2. Bit Defender /76%
   
3. Symantec / 75%
4. Panda / 75%
5. NOD 32 / 44%

Source: ComputerBild Magazine
After reading that information, you will find that Kaspersky is the best antivirus program and I'm personally using it. I advise you to make it your primary antivirus program.

A way to remove antivirus 2008

You can easily remove antivirus 2008 on Safe mode.
1-Uninstall the program by using "add/remove programs" utility.
2-Delete ".exe" files and unregister DELLs (command: regsvr32/u filename.dll)
in this list:
AntiVirus2008.exe AntvrsInstall.exe AntvrsInstall[1].exe Antvrs.exe, xpa_2008.exe Antivirus-2008.exe, av2008xp.exe, Win Antivirus 2008.exe AntvrsInstall.exe shlwapi.dll, wininet.dll, shlwapi.dll, wininet.dll, AntiVirus2008.exe, Uninstall Antivirus.lnk, AntiVirus 2008.lnk, AntvrsInstall.exe, AntvrsInstall[1].exe, AntiVirus 2008.lic, Antvrs.exe, xpa_2008.exe, Antivirus-2008.exe, av2008xp.exe, Win Antivirus 2008.exe, AntvrsInstall.exe

3-Delete directories: "%ProgramFiles%\ANTIVIRUS 2008"