Usually Bugcheck code 0A and 50 are causded bt bad ram or faulty device driver. When Windows crashes with blue screen, it writes a system event 1001 and a minidump to the folder \windows\minidump
Check system event 1001 and it has the content of the blue screen
Control Panel -> Adminstrative Tools -> Event Viewer -> System -> Event 1001. Copy the content and paste it back here
Zip 5 to 6 minidumps and attach the zip files at any webspace. I will study the dump and find out the culprit.