Anywho, if the current scan comes up clean and you're still not able to d/l anything and/or the FR refresh problem remains, I'd second TLS's suggestion re system restore.
Be sure to tick the little 'show more restore points' box at the bottom to see all your choices.
Windows automatically creates a restore point after each Windows update, and they just rolled one out for 7 a few days ago, so that one will likely be your most current (assuming a 7 box).
Restore mght well fix the current problem w/o creating any new ones, other than the aforementioned need to reinstall anything added subsequent to the most recent restore point date.
My (limited) understanding is that it would also take care of any registry corruption that a bug might've caused.
If several restore points are listed (w/that little box checked) and the problems persist after invoking the most recent one, simply work your way down the list with the next most recent, etc.
Once (if) you're able to d/l stuff again, will also second the suggestion upthread re CCleaner .. another excellent tool, also a freebie.
/.02