What's the best ever Anti virus?

I am using Symantec Antivirus 2005 (version10.0.1.1000)

I need all of yours opinion about this Antivirus. And which one is the best Antivirus avaliable? I formerly used Norton Antivirus 2005, but i changed it bec it was not able to clean Adware/Spywares and my system got infected and needed formatting. My PC has been victim of this viruses 3 times and all the time i had the latest antivirus!! Still they some how got it.

So pls tell me which is the best Antivirus and ur opinion abt Symantec Antivirus 2005.

What's the best ever Anti virus?trojan

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鈼?The very best virus scanners are free. Mcafee %26 Norton Antivirus are mostly hype and won't do as good as the free ones. -- About.com %26 Smart Computing Magazine

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鈼?Microsoft's New Live Safety Center. Download this scanner to check and remove spyware, viruses, get rid of obsolete files and junk off your computer, and improve your PCs performance.

鈽?http://safety.live.com/site/en-US/defaul...

鈼?The Microsoft Windows Malicious Software Removal Tool checks computers running Windows XP, Windows 2000, and Windows Server 2003 for infections by specific, prevalent malicious software鈥攊ncluding Blaster, Sasser, and Mydoom鈥攁nd helps remove any infection found. When the detection and removal process is complete, the tool displays a report describing the outcome, including which, if any, malicious software was detected and removed. You can run this tool online FREE.