Hello, I wasn't sure if I should place this in here or in the Windows OS section, but after several reformats I have concluded it's not a software issue, but a hardware one. Onto the problem. Everytime i'm in Windows it works fine for awhile until I actually do something on it, like try and update to SP2 or access certian options in the control pannel. I click on an icon and I get the loading cursor, then it changes back to the normal cursor and nothing happens, it doesn't load anything. After it starts doing this it happens to the whole PC, I can't load games or any program, they just don't respond. I'm using WindowsXP - Pro and I had no trouble with it until I encountered a CPU failure about 2 weeks ago. I RMA'd the CPU and have recieved a new one. The new CPU itself runs fine, can play Doom3 without problems (once I can get into the game, which is hit and miss) When I recieved the new CPU, I formatted the HDD and reinstalled WinXP on a new partition, now I get the problems described above. My specs: Abit NF7 V2.0 nForce2 chipset 400MHz FSB (Latest BIOS) AMD AthlonXP 3000+ Barton, 400MHz FSB 512Mb Generic RAM PC3200 CL2.5 (Was 1Gb, one stick of the 512 was faulty) Maxtor 80Gb 7200Rpm HDD - Primary IDE Master Sony DVD drive - Secondary IDE Master Radeon 9600 (This only has a heatsink, so dosen't require power from the PSU) 380W Antec TruePower PSU I am tearing my hair out here . I have replaced almost the whole computer and it's really depressing spending money guessing which part is broken. At the moment im putting it down to either my Radeon, Maxtor or my NF7 but i'm not sure how to go about finding out. I know it's not my WinXP installation becuase that has reinstalled no problem several times now (onto the same HDD ofcourse) Any suggestions? Thank-you in advance.