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#11
You need to run Startup Repair from the DVD or Repair CD so it isn't dependent on HD files which may be infected.
First however try to boot into Safe Mode to install, update and run a Full Scan with Malwarebytes: Malwarebytes
If you can't get into Safe Mode, run a free bootable AV scan from CD: FREE Bootable AntiVirus Rescue CDs Download List
Next burn a Repair CD if you don't have Win7 install DVD: System Repair Disc - Create You can immediately copy out your files: Copy & Paste - in Windows Recovery Console
Then run Startup Repair up to 3 separate times with reboots. It should automate System File checker; if not, run it from System Recovery options Command Line: SFC /SCANNOW : Run in Command Prompt at Boot and try System Restore from the options list, too.
If Win7 will not start, run Factory Recovery from boot Or using a Win7 installation DVD, clean reinstall after wiping the HD of infected or corrupt code: re-install windows 7