blue screen on return from sleep

The computer was return to Dell for repair and ever since I received it back I have had this problem.  Whenever I bring the computer out of SLEEP I get a blue screen error: KERNEL DATA IN PAGE ERROR AND 0x00000F4  (there is other information but it remains on the screen for so little time I can not copy or read it all).  It also does not recognize Drive C.  Any help would be appreciated......the drivers are all updated and current.

Windows 7 Prof w/SP1; Dell 1557 Laptop;