What purpose does c:\windows\prefetch serve. Can deleting it’s contents cause any problems?, also what is MmjbUpdt.exe? It starts to run when I open musicmatch juke box and it pushes the cpu to the limit. I’m still working on my overdriven cpu problem and have done everything except increase virtual memory space and eliminate the above mentioned prefetch file. Thanks Angelljr 8200 dell 1.9 g 256 meg ddr ram