Hi EDIT: I thought putting details in profile would mean they auto appeared - wrong! xpprosp2 GA-7ZM mobo micro-ATX Via Apollo KT-133 chipset 448MB SDram pc133 (64+128+256 in 3 slots) Athlon 1200 cpu WDC 20GB HDD 5,400 Samsung combo cd-rw Enermax PSU 230W - new Philips soundcard seismic edge (use O/B sound too for speech input only) NVidia Riva TNT2 graphic Realtek network card Been getting more frequent BSOD over last month. Have read 'stickies' and attempted to implement advice - no help. I changed PSU as old one stopped turning on - now new Enermax micro-AT 230W but problem started before that. memtest seems OK on 10 passes. Not overheating MMM5 says cpu 50-55C. Not o/clocked. GPU - how to read? Changed pagefile - no help Chkdsk seemed to not report problems - neither did WDC disk-checking S/W Event viewer shows Error 1000 and 1001 most commonly in red but not very often and not linked to BSOD it would seem. Can't really see relevance of info from MS! Stop messages are not consistent - had IRQL-NOT_LESS_OR_EQUAL a couple of times. Seems to happen when surfing but then that's the major activity! Have sought to update drivers thro Windows update. No recent changes to PC that I haven't undone to see if helped Thanks for any help. Attached minidump.