Computer crash when I plug in USB flash drives? READ THE WHOLE DESCRIPTION!?

I had a similar problem using the headers on one of my system boards. Whenever I unplugged a flash drive from the port without first telling Windows to disconnect, the computer would reboot. After several posts on different tech sites and many, many phone calls to the manufacturer's tech support we determined that the USB controller itself was faulty. This is likely the same for you and the only way to test this to be sure is to get an add on USB card and try to insert your USB drives through it. If it still reboots when you put the drive into the card, then I am at a loss. Either way, I recommend you replace the system board.

EDIT: So it is your belief that just because something worked once, it will always work? Well, if it is just a driver issue, then buying and installing PCI USB card will not help because it will use the same drivers. But if it did work.... hmmm... when I troubleshoot a computer I tend to test every possibility instead of focusing on one.

You can ununstall your USB drivers easily and upon reboot Windows will re-install them. If they had gotten corrupted, they will be repaired. To do this, go into the device manager and under USB devices simply uninstall everything. Windows will actually delete the stored drivers for these devices (the ones in the system32 folder) and after your done reboot. When Windows reboots it will detect the USB devices and install the drivers from the drivers.cab file (replacing the old ones with the ones from your first install). If Windows does not automatically detect the USB, simply go into the Device Manager and click any item and then click the Scan for Hardware Icon at the top (but you have to click in the right window before this icon appears).

This is all I can think of that might help.