Also give an online scan a go here are a few, best to use Internet Explorer (will need to allow/install ActiveX controls)
Anti-virus/antispyware
TrendMicro Housecall:
http://housecall.trendmicro.com/
Panda Activescan:
http://www.pandasoftware.com/products/activescan.htm
Kaspersky:
http://www.kaspersky.com/virusscanner
eTrust Antivirus:
http://www3.ca.com/securityadvisor/virusinfo/scan.aspx
Bit Defender:
http://www.bitdefender.com/scan8/ie.html
Choose your favourite, and off you go.
