Greetings, I have an old Asus K52J that overheated and shut down some weeks back. After replacing the worn out fan and eventually the heat sink unit and copper tubing, I finally had it back up and running perfectly for several hours after being down for a few weeks. It was running perfectly at 100 degrees Fahrenheit for multiple hours this morning, but eventually was forced to reboot for a Windows Update. I didn't get to see what happened (I have multiple machines/screens and I was looking away while it was updating), but it eventually was in a shut down state and I manually restarted it. I was prompted with a BIOS message stating that some files were corrupted and a recommendation that I allow Windows to correct this issue as well as the option to start normally. I opted for the recommended option. 30 seconds later the machine shut off after booting into Windows 7 (in the background with a repair dialog box running in the foreground). I restarted, tried again, same results. I restarted again, hit F8 repeatedly so I could try to run the repair diagnostics, and it shut off again within 30 seconds. I restarted again, did the F8 thing again, tried Safe Mode, and same results. After opening up the laptop and touching my hand to the heatsink, the vent, and the copper tubing, I can say with 100% confidence it is not a heating issue, it is a software issue related to this Microsoft Update (that happened today, but might be many days or possibly a couple of weeks old). I cannot confirm which one it is since the machine won't stay on for more than 30 seconds. I am running Windows 7 Home Premium SP1 on this machine. Any suggestions or help would not be unappreciated. Thank you.