BSOD variety

[legend trail]

Getting a variety of blue screens, mostly system service exceptions with a few process has locked pages. Crash dumps are attached. BSOD occurs after closing application Cubase v 6.5.1 . C6 may either appear to close normally ( I get a desktop and can navigate to and operate in other applications and the internet) or it may go into wait state and hang there. If so, it cannot be ended in task manager. Then in either case if I attempt shut down, or just sit in wait state for a minute or so, I get a blue screen. BS only happens after running Cubase 6.5, otherwise startup, operation and shutdown proceed without incident. Also, prior to the 6.5 update, I was running version 6.0 without any problems. Drivers reported on the blus screens are
ntoskrnl.exe and stdriver64.sys . Thanks in advance for any help you provide.