I think that the pertinent question that needs to be asked is, first of all, why exactly did you have to replace your original motherboard? Have you gone back and snugged down all of the cables? Did you do a clean Windows install after replacing the motherboard, or did you just use the prior Windows install?
I'd also recommend downloading a hard disk utility from the manufacturer's website and running a check on the hard drive just to be sure it isn't failing. Also, from an elevated command prompt, run SFC /SCANNOW to see if you have corrupted system files.
Last edited by Steltek; 11-07-2012 at 12:37 PM.