Often Windows crashes are related to the unsupported drivers or hardware connected to the pc but it may not be the case all the time. The crash which you may think is because of issue with your PC might the actual bug in Windows. One such Windows 7 Service Pack 1 crashing issue has been identified by Microsoft.
According to Microsoft, Windows 7 SP1 may crash with the following error message,
“Stop 0x0000007E (parameter1, parameter2, parameter3, parameter4) – SYSTEM_THREAD_EXCEPTION_NOT_HANDLED”
Though error message may vary, depending on the configuration of the computer. This issue occurs because of a race condition that is triggered when a NULL lease handle is accessed after the lease spinlock is released. Microsoft has released an hotfix (Fix367138) to fix this issue.
If you are the one who is facing Windows 7 Service Pack 1 intermittent crashes may use below link to download hotfix.