Windows 8 and 10 have repair tools built in. Other Windows have other things to try but since you got this from tweaking.com what do they write to do next for that download?
Some of these apps do more damage than repair.
On tuesday I went to use my computer and couldnt get connected to the internet, it kept saying "diagnostics policy service is nit running". After looking through forums to try and fix this I came across one which suggested I downloaded the windows repair tool from tweaking.com. I went to the repair tab and left it for a few hours to do the repairs. However it hasn't fixed the problem and now my computer will only boot up in safe mode. Any help would be greatly appreciated as I have no idea whats going on!