Posted by MikeC on Friday, June 30, 2006 at 5:42PM :
In Reply to: O.T. computer question posted by Bob Thompson on Thursday, June 29, 2006 at 11:42PM :
It's most likely either an antivirus scan or an antispyware scan that fires off at that time of the night. As was mentioned earlier, open task manager and see what process is chewing up your resources (click on the CPU heading to sort by that column).