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Viruses morph and change all the time. No system is totally immune to them. Firewalls can be bypassed, AV companies struggle to keep up with the daily changes to existing malware, as do all security software vendors.
W32 Virut is considered polymorhic and parasitic. It changes to avoid detection and keeps itself alive on a system, while injecting it's code into various files. Some variants may disable your security software rendering them useless to prevent the corruption.
This is a backdoor trojan and you should be aware your system security has been compromised. If you have any sensitive data such as banking or other personal information on your computer you should go to a known clean computer and change passwords.
This is not a new virus. You can get infected many ways. It is unlikely someone specifically targeted you - more likely you happened to click on the wrong thing at the wrong time. If you really want more information I can direct you to some technical sites about it - but the reality is that you are already taking the recommended action for a backdoor trojan infection by reformatting.
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