I would try the http://www.microsoft.com/downloads/details.aspx?FamilyId=AD724AE0-E72D-4F54-9AB3-75B8EB148356&displaylang=en It is a free tool offered by microsoft (I gave you the updated march 2009 version). It takes a while to run but it is well worth it. I would also give http://home.mcafee.com/Store/Package.aspx?pkgid=275 a try. It is a bit on the pricy side $39, but it includes a license to run it on 3 different computers without buying seperate software. It is all of the suites that Mcafee offers, all in Try out whatever one you like and I hope you get rid of that worm/trojan robots199 signing off and wishing you well
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lol @ advert attached next to your question "sponsored by Norton from symantec"
On topic: If it's a pretty nasty bug, I usually just nuke and pave - reinstall the operating system. Some bugs can be removed with standard antivirus (even free antivirus, avg, avast, etc) but you never know if that simple trojan came with a rootkit.
Best free anti-virus software I have come across would have to be Avast!
It blocks viruses from getting onto your computer in the first place, and easily detects and removes any existing ones. Since using it, there have been many viruses trying to get onto my computer, but Avast has blocked every single one. It even got rid of the existing virus I was stuck with. Here is a link to Avast's homepage, don't worry if your "license" expires, it will still be free for you to use. Trust me, you will thank me. :]
I find that all of the commercial virus software are horrible at removing trojans and virii.
Get malwarebytes anti-malware. (Its free, and contains no spyware)
Also Combofix is a good program. But I strongly suggest you go to an anti-malware forum and post before using it. Combofix is a powerful tool that in uneducated hands could wreck your computer.