Why is my computer blue?

Most of you aren't aware of this, but my computer has been shutting itself off alot lately. This was Shawn's computer prior to it becoming mine. I have no idea why it does this, but it always seems to shut off while I am in the middle of a post or uploading photos. Finally after the One Millionth time of doing this, it finally opened a browser window and said: Blue screen error caused by a device or driver You received this message because a hardware device, its driver, or related software has caused a blue screen error. This type of error means the computer has shut down abruptly to protect itself from potential data corruption or loss. In this case, we were unable to detect the specific device or driver that caused the problem. Troubleshooting The following troubleshooting steps might prevent the blue screen error from recurring. Try them in the order given. If one step does not solve the problem, then move on to the next one.  Step 1: Download and install the latest updates and device drivers for your computer  Step 2: Remove any new hardware or software to isolate the cause of the blue screen  Step 3: Scan your computer for viruses  Step 4: Check your hard disk for errors  Step 5: Restore your computer to an earlier state  Advanced troubleshooting