Hi Whenever my XP Pro SP1 (+ all critical updates) system is asked to do something with a big file (write a CD, copy a 500MB+ file, convert WAV to MP3, watch a movie, etc), it pushes all of the existing apps and a lot of the OS to the disk cache. Just to Alt-TAB to another app takes 30-60 seconds (I have a pentium 4 4GHz notebook). And just to bring up a print dialog or right click on the desktop menu can take 20-30 seconds to come up. It's insane and it's driving me nuts. I tried setting the cache for a server and for a workstation - no difference. It used to run fine, so it's something I have done. I've Googled my *** off, I have been all over MS, IRC and all over the place, and so far I am still to run into someone who's even HEARD about this problem at all, let alone knows how to go about fixing it. Is there anyone here who is able and willing? I'd be SO grateful.