aaaarrrrg i just typed a long reply but my browser crashed
basically...
do u have an Avance logic sound card?
it seems the file ALCXWDM.SYS is the problem.
AC'97 Audio CODEC (ALCXWDM.SYS) was created by Avance Logic® and is not digitally signed (not certified by microsoft) so can cause problems with windows.
an update (fix?) can be found here >>
http://www.realtek.com.tw/pctech/pc-...&Software=True
other than that make sure windows if updated