BleepingComputer.com: Everything suddenly sloooow

I have a Dell Inspiron 1720 with Vista SP1. I got a virus about 2 weeks ago and re installed Vista. Everything worked fine for a week, then the computer became slow at some point. I use the computer for music production so I noticed everything slowed down because my projects were suddenly overloading the system.

Anyway, I have tried to work what is wrong. I have scanned with Kaperksy, Ad Aware, Spybot and not found anything. I have checked device manager and everything is working fine. There is plenty of space on the hard disk. I have checked programs running at startup and disabled any unnecessary. I have checked disks for errors.

So what else could it be? And everything worked fine for a week after re installing the operating system, then everything seemed to suddenly slow down. I had been installing a lot of software, but only programs I had on before I re installed the operating system.

Any help appreciated

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How did you accomplish that?
If you used a back up drive, perhaps it was infected?

yeah, a back up drive was involved.

But I have scanned it with Kapersky, Ad Aware and Malwarebytes anti malware and nothing showed up.

You reckon there could be some hidden virus on there or its corrupted or something?

More than likely. Visit the "am I infected" section here.