you guys don't read. he said that he already scanned with AVG and no viruses were detected.
One virus system does not always crack it. I run AVG and recently had slow dows and used AVAST which found some virusses and Adware that conned me around!
Removal of hardware with software and drivers still lurking in background may also be a culprit so is harddrive cables. Recently have major slowdowns and harddrive light constantly bright YET CPU load is low ?? I found that the one SATA cable was suspect and caused the continues reading and thus slow down but it did not show on CPU load. Replaced cable and are now smiling again!