Help - I suck at computers

[Hershey]

Took an older lap-top, reformatted it and all that good stuff. Have it 99.9% up and running, only issue is when I try and run the Windows Update ONE thing won't update.

It's the "Microsoft .net framework 4.5.1". I tried downloading it manually and still didn't work. The code error just reads "A fatal error occurred" and is code643. I googled the shit out of it, but couldn't find anything helpful besides to run the Repair, and Fixit which both didn't do shit.

I wouldn't give a shit but I start a computer coding class tomorrow and I assume we're going to use Microsoft Visual Studio which itself tries to update to 4.5.1 and won't download because of an error.

If anyone else has had this problem, or heard of it, any help at all would be top notch shit. Thanks homies.