Guiminer has become unstable on my system since the latest Win7 updates. I get the "blue screen" error after about a half hour of mining and my system reboots. I was using the packaged poclbm miner that comes with GUIminer. In the hopes of fixing this I updated to the latest poclbm but still had the same crash.
Here's the list of updates that I did on 11/13:
Update for Windows 7 (KB2763523)
Security Update for Windows 7 (KB2761226)
Cumulative Security Update for Internet Explorer 9 for Windows 7 (KB2761451)
Security Update for Windows 7 (KB2727528)
Update for User-Mode Driver Framework version 1.11 for Windows 7 (KB2685813)
Update for Kernel-Mode Driver Framework version 1.11 for Windows 7 (KB2685811)
Update for Windows 7 (KB2750841)
Update for Windows 7 (KB2761217)
Security Update for Microsoft .NET Framework 4 on XP, Server 2003, Vista, Windows 7, Server 2008 x86 (KB2729449)
Security Update for Microsoft .NET Framework 4 on XP, Server 2003, Vista, Windows 7, Server 2008 x86 (KB2737019)
Security Update for Microsoft .NET Framework 3.5.1 on Windows 7 SP1 x86 (KB2729452)
I left out some updates to MS Office.
I've been using GUIminer on a Core Duo with a 5830 and have had no problems until now. I've switched to 50Miner in the hopes that this problem will not happen using 50miner. I mine on 50BTC anyway. I tried 50miner before and it seemed to give me slightly lower speeds than GUIminer but now that GUIminer is unstable I have to try it again. Also it seems that it has some nice added features that GUIminer doesn't have.
update: well it's still crashing with 50miner, so it's not GUIminer that's causing the crashing. Who knows if it's even bitcoin mining that's causing the crashing? I don't.