I upgraded from XP to Win7, got everything running smoothly and then a week later upgraded the Motherboard, Processor and Memory. Then the problems started. I have updated every driver known to man and all looks well in the device manager. However after a smooth boot the OS hangs up sometimes 10 minutes later sometimes 1 minute after boot with no activity at all. At times I can go to the internet for a few minutes and browse at times it hangs immediately. I am running with a Selective Startup with only necessary services running. Makes no difference. I can view the event log and get a " The Computer Browser service depends on the Server service which failed to start because of the following error: The dependency service or group failed to start." But I am not sure if that is the cause or the result. Safe Mode works OK.