I'm writing this from my laptop as my desktop is increasingly unstable and has been f,r a while. I've taken advice from tech-wise guys, online forums and spent money with computer repair shops trying to sort it. Windows Vista Home Premium has been reinstalled more than once, hardware disconnected, drivers updated, memory has been tested and swapped - and whatever else I could think of or has been suggested. The words "Windows has detected a problem..." or "The "application" has closed and is restarting.." are so familiar that I no longer scream. I have a Packard Bell imedia, with Intel quad core, 4Gb Samsung memory in two strips (although system only seems to recognise 3) runnig Vista Home Premium 32-bit. 500Gb HD and a 250 PSU. When I get a BSOD the codes/files quoted are invariably different and often there are no files quoted or other indications apart from "Windows detected a problem.." These things seem totally random - today, for instance - the first time ever - I was told that "plug and play" had stopped. But I often don't always get a BSOD - I just get messages such as "Desktop Windows closed.." or "The application stopped..." or "Internet Explorer closed..." and very occasionally no message at all, just a restart. I did suspect my Kaspersky protection, but problems occur with or without it, though seemingly less often when it is stopped - and I have the same security on this laptop (Windows 7) without the slightest problem. Professional advice has been to reinstall Windows - done twice with only short temporary gain. Can't see the point of paying yet again for the same advice.