I just gave you a list of Troubleshooting steps which provides in Step 5 the ISO and tool to burn a Windows 7 installation DVD for your licensed version, to use for repair or if necessary reinstall. Did you even bother reading it?
If you're at all interested in getting and keeping a perfect Clean Reinstall - Factory OEM Windows 7
follow the steps in the blue link which also provides the installer. For as long as you use only the tools and methods given you'll have a perfect install.