Trying to find the problem to a friends computer: The computer has Windows XP home edition and it gets slower and slower during boot up until it just freezes. They took it to some shop that said the CPU was over-heating b/c the fan in the back was backwards. they turned it around and charged them $60 and didn't bother checking to see if it was fixed. Its not, i took Knoppix to it, just to see if it was the hard drive that was bad, and knoppix runs alright for a while on it until it eventually it slows to the point of pretty much freezing. Its a fairly good computer, cant find the speed of anything yet but it has 512 mb of ram with cooling plates on them and all the fans are working properly. What else can i do to locate the problem?