The "Blue Screen of Death" is basically an error which is so serious that Windows cannot continue functioning in the current session, leading it to restart and show the blue error. Registry errors are the most common cause of Windows 7 errors because of the way your computer will be using this part of your system. The registry is basically like the "Yellow Pages" of your PC - a central directory of important files and options that Windows computers will use to help load up everything from your desktop wallpaper to your most recent emails. It's often the case that registry errors will cause all sorts of problems, leading your system to run much slower and with a lot of errors.
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