I installed the first Service Pack 3 last year. My cpu got all jacked and drive letters went away etc. I uninstalled it. Later I ended up reinstalling W2K Pro, formatting etc. I am wondering if SV 3 has been updated lately? I have some driver conflict where my Nero Express causes machine to reboot with K_mode_exception_not_handled error message. Could latest SV3 maybe help with this? Do I need SV3?