In addition to your antivirus software you have,it is very wise to put special virus tools in your computer without having conflict with your primary antivirus software.
Here are some tools that I found while browsing in the net:
Sandboxie runs your programs in an isolated space which prevents them from making permanent changes to other programs and data in your computer.
LINK:http://www.sandboxie.com/
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Kapersky Special Virus Removal Tools are various tools for specific viruses.
LINK:http://www.kaspersky.com/removaltools
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Mcafee Stinger is a stand-alone utility used to detect and remove specific viruses. It is not a substitute for full anti-virus protection, but rather a tool to assist administrators and users when dealing with an infected system. Stinger utilizes next generation scan engine technology, including process scanning, digitally signed DAT files, and scan performance optimizations.
LINK:http://vil.nai.com/vil/stinger/
