Knock on wood, this has not happened to me in a very, very long time, but every once in a while the Microsoft Windows system files will become corrupted and report errors. The solution to this annoying, but fixable, problem is to repair the files. A reboot of the PC will often do the trick, but there is a way to repair files while Windows 7 is running and, presumably, you are working productively.
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First you will need to start a permission-elevated command-line prompt. Type command into the Desktop Search box and then right-click on the Command Prompt menu entry and select the Run as Administrator item (Figure A).
Figure A
Run the command prompt as administrator.
After accepting the elevated permissions, at the prompt type this command:
sfc /scannow
Now the system will verify the system files and repair any corrupted files (Figure B).
Figure B
Scan for errors.
My test system had no errors (Figure C); however if it did, this scan would have repaired any corrupted files, but without forcing a system reboot.
