Hi guys I have been getting quite a few stop errors recently, most notably the IRQL_NOT_LESS_OR_EQUAL error, but also MEMORY_MANAGEMENT and PFN_LIST_CORRUPT. Numerous error codes inc 0x0000000, 0x0000074, 0x0000003, 0x0000002, 0x0000014c, 0x000000a, 0x0000017 and 805E74A1. I have recently reinstalled XP (not formatted though) and have tried various video drivers, i have Norton av 2002 and Sygate personal firewall v4.2 installed also. Would any of these apps cause problems? Asus A7A 266-E Athlon XP 1700+ Asus v7100 pro GeForce 2 MX 400 64MB 23.12 dets at present WD 60GB HDD XP home ed 512 MB PC2100 DDR ram (unsure of make) I have had the computer back to the manufacturer on 3 occasions and twice they swapped out the RAM, so i am not entirely convinced the RAM is at fault. Any ideas would be gratefully accepted.