Windows 7: System File Checker tool not working.

This is what it says, Windows Resource Protection could not start the repair service.

What should I do?

Try this:

1. Click Start, type Services.msc
2. Double-click Windows Modules Installer
3. Set its Startup type to Manual
4. Click OK.

Thanks for the help but that didn't work.

Boot into System Recovery Options to run SFC -SCANNOW Run in Command Prompt at Boot

If this fails you may need to consider a Repair Install.

Please explain your initial problem(s) a bit more.

Yep, greg's suggestion is next in line. Even in this process it is quite possible you may get the same error message.

Before you get going with that procedure just try this. Get into \Windows\winsxs and look for pending.xml file/s and rename them. Then run sfc.

Problem not resolved or you did not find any pending.xml file/s??

Move on to greg's suggestion.

I also understand that McAfee antivirus can cause this problem. If you have it on your PC uninstall it lock, stock and barrel and then try sfc.

And if you know for certain that this problem started only recently on some failed updates/program install/uninstall, and some events like that, you may try restoring the system to a point before that with system restore and check.

What is your AV? I'd install Microsoft Security Essentials and run a full scan now.

Also install Malwarebytes scanner, update it, run a Full scan.

I did get the same error and I don't have a pending.xml file.

This is my exact problem.

Possible issue where .NET Framework 4 setup reports success but fails to update mscoree.dll behind the scenes - Aaron Stebner's WebLog - Site Home - MSDN Blogs

What are the results of the AV and Malware scans, and SFC run from Repair Command Line?

I created a new partition on my Hard Drive installed a Brand new operating system on that partition and installed .NET Framework 4, plus the software that required it and it works... I guess I will need to repair my old OS on my old partition? How would I do this using a USB with the OS already on it?