This is a useful collection of free external online virus scans.File this lot away for when you have to debug a computer that's full of viruses.
First up, download and install CCleaner and run it so that you are not doing scans on thousands of junk files. Here's the link - CCleaner
http://www.piriform.com/ccleaner/download or
http://www.filehippo.com/download_ccleaner
Here are the links for the virus scanners. You may need them all.
BitDefender QuickScan
http://www.bitdefender.com.au/scanner/online/free.html
ESET Online Antivirus Scanner
http://www.eset.com/int/home//products/online-scanner/
Microsoft Security Scanner
http://www.microsoft.com/security/scanner/en-gb/default.aspx
TrendMicro HouseCall Free online virus scan
http://housecall.trendmicro.com/au/?WT.mc_id=2008HP_TRC_HouseCall
Also make sure that Windows Updates are up to date
Now go read my post on setting up a computer with free security programs.
Cheers. Si.
Checked April 2014 for link and relevance. Still very valid for Windows XP and Windows 7
