Thank you. Yes, that's a RAM disk for Firefox (MUCH faster and more responsive). I will disable it and test. Which trace did you check, though? OK, tested. Shame on me for ignoring RAM disk. With RAM disk disabled, Windows shuts down in under 30 seconds. Funny thing is that it takes 30 seconds to save the disk and (without it) about 20 seconds to shutdown Windows, but when RAM disk is enabled shutdown takes around 4 minutes. How is that possible? Anyway, thanks for pointing that out! I guess I'll have to remember to unload RAM disk before each reboot.