The thing that led me to your site, was the inability to update windows.  I had tried everything.  Any scans I attempted I did in safe mode and came up with nothing.  There was nothing anywhere that would let me update Windows.  I tried every suggested to fix or tweak, or reinstall this, or that, nothing worked.  It wasn't that I would get an error, it would just not load and would eventually timeout.  So I decided to try your site.  
I'm running Win 7 Premium.  I followed everything to the letter!  Did the chkdsk /f on restart and it came up with nothing and I did sit and watch, and there were no bad sectors.  When my computer kind of crapped out (very slow, could barely load a web page and very delayed response when I clicked on anything, like task manager, control panel etc.   I ran some more scans in safe mode with other tweaking programs.  I did finally manage to get better speed and response.  I tried again to update windows..nothing, nada, it would not update and felt very much like that's it, computer is done.  I use this desktop for work, I work from home.  Then I did something I'd been avoiding...
I went to Win 10 Update and damnit I did not want it.  I have it on my laptop and hate it.  Anyway, it took the update immediately! I feel like I am being forced to upgrade!