Please, go to folder \windows\minidump and send the newest (recent) .mdmp files for analysis. There is also C:\Windows\Memory.dmp file.
Better if you can compress (zip) them and add some information about the BSOD and the link for this thread.

Send an email to: vlk (at) avast.com
Or upload it to this anonymous ftp server:
ftp://ftp.asw.cz/incomingOops... I did not realize you're using server version... Maybe what I've posted does not help.