You are trying to do Repairs from the crippled OS which is not possible.
Try Malwarebytes in Safe Mode. If no go, Download and burn to CD or write to flash stick Microsoft Standalone System Sweeper
, boot and run a full scan.
You need to make a Windows 7 Repair CD or use the REpair console on the Installation DVD: System Repair Disc - Create
Run Startup Repair
repeatedly which automates most tests and fixes, making sure Windows 7 or it's 100mb System Reserved partition (preferred) is still marked Active: Partition - Mark as Active (Method Two)
If this fails, from the System Recovery Options
run System Restore.
Next from the Command Line run SFC -SCANNOW Run in Command Prompt at Boot
If these all fail you can copy out your files: Copy & Paste - in Windows Recovery Console
Then run Factory Recovery partition, Recovery disk(s) which you made or came with computer, or clean reinstall with Product Key on COA sticker following these steps to get a perfect OEM reinstall: Reinstalling Windows 7