Shoutbox

Or even better, restore it with SFC:

If you have Windows XP:
Go to Start > Run, type "sfc /scannow" and press enter.

If you have Windows 9x:
Go to Start > Run, type "sfc" and press enter.
Select the second checkbox ("Extract a file..") and write "mspaint.exe" in the textbox. Click Start.
In the "Restore from" textbox, write the location from where you installed Windows, or insert the Windows CD and write the path to the CD drive.
In the "Save file in" textbox, write "X:\Program files\Accesories" (where X: is the drive where Windows is installed).