The easiest solution is to update your mpegport.sys driver or install a version of mpegport.sys that is compatible with SP2. If you can't find a new mpegport.sys at hand for a while, you can temporarily disable the DEP memory protection mechanism. The method is: restart the computer, press F8 after the BIOS information appears to enter the "Safe Mode", click on "Start - Run", type in "cmd", and then click "OK" to enter the command line window; at the command prompt type bootcfg /raw "/noexecute=alwaysoff /fastdetect" /id 1, then Press "Enter" and reboot your computer.