Hi, sorry to hear of the problem with your machine.
Did you get a stop error on the blue screen?
If so we need to know it.
You have run chkdsk /r
and that was a good move….run it again just to be sure.
Have you run memtest86 to check your memory?
Have you run any other disc checking tools? (other than chkdsk /r)
Further information from here:
http://www.bleepingcomputer.com/forums/topic28744.html
http://www.memtest86.com/
when running memtest, use the free download, burn it to a CD Rom as an image (iso) and let it run overnight.
Remove all peripherals, empty USB slots , optical drives, and just have a power cable video , mouse and keyboard connected (if a desktop computer)…if it's a laptop, remove the battery and run it from the power adapter, but with all slots empty and nothing else connected.
Post back with full details of machine, model number, error codes, and exactly when the problem first started and what actions you or any user of the machine had taken in the week preceding the trouble starting in respect of:
hardware added or removed,
and software added or removed..
and we will advise the next step
Regards
paws