BSOD after new CPU HeatSink

So me and my friend installed a new cpu heat sync and dusted out his computer with a air compressor. we just installed a new windows 7 os and he still is blue screening. he was getting KMODE_EXCEPTION_NOT_HANDLED / SYSTEM_SERVICE_EXCPTION / IRQL errors and such. We also moved the ram around but i dont think it is the cause. the heat sink we installed was


Here is his build