Fake Windows Defender Page

While using Mozilla Firefox I kept getting a fake Windows Defender page which told me I had a serious virus infection and that I had to call Tech Support (1-800 number kindly provided) to fix it. There was an animated cursor running all over the page, lights flashing, etc. I shut Firefox down, started back up, and got the same page when clicking on another web site.. So I came here and on the advice of a member, ran the Malware removal instructions. I got everything done except MGTools. It downloaded to my root drive fine, and ran when I clicked on it. But it gave me the following text in the DOS window:
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The following feature couldn’t be installed:

NTVDM

Windows couldn’t fine required files to complete the requested changes. Make sure you’re connected to the Internet, and try again.

Error code: 0x80070490

Tell me how to solve this problem
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I was connected to the Internet using Chrome. So I tried again using Explorer, then with Firefox. All with the same result. I am the Administrator on this computer, so not sure what to do there. In any case, it wouldn't respond to trying again, and sent me to a generic Windows page for problem resolution from "Tell me how to solve this problem." No help there. Plus there was no MGtools zip file created.

So anyway, here's the info I did get from ADW cleaner, Malwarebytes, Roguekiller, and HitmanPro.

Keith

 

So, the computer needs NTVDM to run MGtools, as MGtools a 16 bit program and NTVDM allows a 32 bit processor to run 16 bit programs. A quick Internet search tells me that I should already have it on my system, but MGtools seems to think I don't. To be clear: MGtools batch file downloads and runs. It's not being stopped from doing either. It just doesn't complete the task, giving me the error noted above.