Try ==>>
Use the System File Checker tool to repair missing or corrupted system files
But my Googling suggests it could be a hardware fault eg at Bleeping ==>>
Repeated APPCRASH Errors (Stackhash issue?) - Windows 7
IMO Bleeping Computers is 'the best' place to go for this sort of thing - do what Louis suggests in that thread, d/l his diagnostic pack, then start your own thread at Bleeping with the info from Louis' diagnostics pack.
BR