|No, reinstall Windows. If you have access to another computer that is running the same operating system and service packs as your computer, you can try copying the explorer.exe file from that computer and pasting it over the explorer.exe file on your computer. You'll need to do this before Windows loads (perhaps using a live cd, or by connecting your hard drive to the other computer using a USB to IDE adapter).|
What I was saying is that if that ^ is not possible for you, you can reinstall Windows, which will (obviously) replace the explorer.exe file with a known good copy.
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