It is more likely you have a memory fault, though I would expect it to show up during initial install, not during updates...

Download and burn one of these iso's to create a bootable CD (DVD?):
http://www.memtest.org/#downiso
this will perform a memory test that you can confirm or not, my supposition. It is also possible that there is another fault.


--=-- My credo: If it's worth doing, it's worth overdoing - just ask my missus, she'll tell ya laugh --=--
You're only paranoid if you're wrong!