BSOD right after laptop was resuming from sleep/hibernation

Hi! I have a Sony Vaio VGN-CS35GN. It came pre-installed with Vista 32 bit, but I am now using a licensed institutional version of Windows 7 Professional 32-bit. There’s only one OS. The laptop recently has a had a problem with cooling. If i was playing videos/ or even if the laptop was on for a few hours otherwise, it was shutting down immediately. But I did not get any BSODs then. I...