Anti Virus

AVG Anti-Virus Free Edition 8.0
Basic antivirus and antispyware protection for Windows available to download for free. Limited features, no support, for private and non-commercial use only.
Free Download : http://free.avg.com/ww.download?prd=afe

Norton Anti Virus
Symantec
Symantec downloads include virus removal tools, virus definitions, security updates, freeware, trialware, and more. Please select from the links below to locate what you need
Free Download : http://www.symantec.com/downloads/index.jsp