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#11
Start with the bootable AV scans from Troubleshooting Windows 7 Failure to Start
and then once at least two of them confirm its clean, run SFC /SCANNOW Run in Command Prompt at Boot until all System files are repairs. If this fails try the Repair Install.
But you'll end up with a much better install if you boot the installer to Clean Reinstall - Factory OEM Windows 7 , making sure to delete all partitions during install. There is a step in either tutorial to rescue your files if needed. But put them on a quarantine disk or stick until scanned thoroughly with MBAM and your AV.