At work we have a procedure that we follow to ensure that everything is done right.
First we do a quick scan for malware.
Then we physically clean out the PC and check the fans
Then we do hardware diagnostics
It isn't until all of this is done that we can get to diagnosing a problem fully.
There just ain't any one program that can tell you with 100% accuracy that you're not infected. Malware infections are diagnosed not only by scan results - but also by the affect that the malware has on the system.
It could be that your virus definitions didn't include the ability to detect a certain virus - either because it wasn't reported to them, or they hadn't finished working on the fix. Or, it could be that this was a new virus and that noone had identified it yet.
In the event that the system is behaving strangely, I always recommend an independent scan (online) to make sure that malware hasn't taken over the programs that are on your system. Here's 2 of them:http://safety.live.com
Finally, attempting to fix a problem that has malware involved in it can cause the malware to morph into another form that's usually harder to locate and harder to remove. And, because it's caused by malware, the standard Windows fixes usually won't work. This is because Windows expects it's fixes to work in a certain way - and the malware doesn't follow these rules!
My browser caused a flood of traffic, sio my IP address was banned. Hope to fix it soon. Will get back to posting as soon as Im able. - John
(my website: http://www.carrona.org/
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