Hi. I'm hoping someone can help as I've spent many evenings on this problem and getting nowhere! When attaching a flash drive: 1. The autoplay pop up doesn't appear; 2. The device does light up initially; 3. The device doesn't show up in "Computer" 4. The device doesn't show up in Disk Management - just Disk 0 (system reserved, C: and I and 0 (CD ROM) 5. The device appears in Device Manager under USB controllers as a storage device but I can't access it. 6. This happens with all memory sticks and occasionally with ipod etc.. but sometimes for no apparent reason they work! All devices works ok with other computers. 7. 9 times out of 10 plugging in a device or turning on the USB attached printer will cause the computer to BSOD, usually with IRQL NOT LESS OR EQUAL 0X0000000A 8. Devices are never allocated a drive letter. The only thing I can think of is that I repartitioned the external hard drive (which I attach to back up) which may have confused the computer with driver numbers? Possibly?! But this problem doesn't seem to have stemmed from then. And I did fiddle with the System Reserved drive as I had back up issues and one of the solutions was to rename it, then I renamed it back again (I think). Sorry if I'm vague on this but I'm not at all computer savvy and the kids are trying to access their homework on the memory sticks! I'm running Windows 7 Home 64-bit, Avira anti virus and the computer is about 6 months old, working ok until a month ago. Can't think that we downloaded anything about the same time as the problem started but possible. I've tried to update all drivers that I can think of but the only one that needed doing was the Nvidia GeForce 7025 which was outdated. All devices etc say they are working properly. Anybody got any ideas? But keep it simple if poss please! Thanks.