As a typical uninstall performed using the Windows removal tool (Add/Remove Programs) is often insufficient, we have provided the recommended removal tools for several manufacturers of antivirus software.
Avast
http://files.avast.com/files/eng/aswclear.exe
AVG
http://free.avg.com/ww.faq.num-1248?srch=uninstall#faq_1248
BitDefender
http://kb.bitdefender.com/KB333-en--How-to-uninstall-BitDefender.html
F-Secure
http://support.f-secure.com/enu/corporate/downloads/removeav.shtml
McAfee
http://download.mcafee.com/products/licensed/cust_support_patches/MCPR.exe
Panda
http://www.pandasecurity.com/resources/sop/UNINSTALLER_08.exe
Symantec (Norton)
http://solutions.symantec.com/sdccommon/asp/symcu_defcontent_view.asp?ssfromlink=true&sprt_cid=6963b863-9269-4ec4-8a44-4e8803bcb0dc&docid=20070816103157EN
Trend Micro
http://esupport.trendmicro.com/support/viewxml.do?ContentID=EN-1033129