Try this 1
First check your RAM. A bad RAM can create such issues.
Remove the RAM from the slot, clean it and place it back properly or try another
slot. If you are having two RAMs then remove it, place only one RAM and check if
you are able to use the PC without any problem. If the problem still exists then
change the slot. If you still having the same issue then try the above procedure
with the other RAM.
If the problem still exists then
Go to C:\Windows. Look for the folder named "Minidump". Zip that file and upload
it to http://www.speedyshare.com/
and paste the download url here.