I had 4 or more lockups a day for around 3 weeks when doing ASP.NET development, not only would it lock up, but in the wonderful wisdom embedded into vista, I couldn't kill it. Sometimes it would be WebDev, sometimes the IDE. I had to reboot, which took forever as vista was still waiting for the "Gracefull" exit. :mad: It turned out that not long before then I had installed zone alarm basic / free version. I should have put two together sooner, but in an attempt to rid myself of the problem I removed not only zone alarm but avast. I replaced them with the free comodo firewall and have not had a lock up since. I believe it was zone alarm that caused the problem. Just thought this may help you, also I have installed the VS2008 hotfix rollup which has fixes for ASP.NET dev. nJoy.