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As you get a 0x1a(memory_management), 0xA(IRQL_NOT_LESS_OR_EQUAL) pointing to hardware and 0x139(KERNEL_SECURITY_CHECK_FAILURE) caused by GPU drivers, please run a few tests.
Run Furmark to test your GPU. Furmark tutorial
Run Furmark for around 30 minutes
Your GPU temperatures will rise quickly while Furmark is running. Keep a keen eye on them and abort the test if temperatures rise too high
Run MemTest86+ to analyse your RAM. MemTest86+ - Test RAM - Windows 7 Forums
MemTest86+ needs to be run for at least 8 passes
for conclusive results. Set it running before you go to bed and leave it overnight. We're looking for zero errors
here. Even a single error will indicate RAM failure.