Hi, I would be very grateful if anyone could help me. Yesterday my computer was working fine, and then suddenly the screen went blue and an error flashed up - this made the computer shut down. I managed to get back in, but now my desktop is a light blue colour and the blue screen keeps coming back. I went into the advanced section in System Recovery and turned of the instant restart. My error says: A propbelm has been detected...ect BAD_POOL_HEADER Check any new hardware is properly installed, ***STOP: 0x0000019 0x0000200.0xEID76E48.0XEID77780. 0XID2791ED I use Windows XP Professional. I'm a bit stuck, I really don't know how to fix this. Unfortunately I no longer have my installation discs. If anybody could help me I would be very grateful!