every time I've started my computer up it brings me straight into a "Checking file system on C:" after the window logo screen appears. it goes through the checking and says everything is completed for the check, after it brings me to the "Blue screen of death" and shows a massage saying
"Stop: c000021a Unknown Hard Error
Unknown Hard Error"
I've searched Google already and nothing is working. I tried to boot in safe mod and that doesn't work. Ive tried to reinstall the OS and the doesn't work either. This started after i open up my case to put in a new pair of 1G RAMs.