microsoft .NET framework error

So I tried to download Discord but it downloaded Microsoft .Net. And I thought it was wrong so i went to task manager and force quited it (should'nt have done that). Now when I try to download Microsoft .net a message saying that it is already downloaded pops up. I tried going into the hkey...

specs are as follows CPU AMD 6300fx mobo gigabyte GA 970A DS3P GPU: Radeon R7 260x psu : 500W VIP when i install the drivers, and reboot, the screen goes blank just after the windows symbol appears, I have tried a different motherboard , screen and have replaced the Graphics card . But still i...