"Unexpected token" within .NET Framework

Question

So yesterday I got a bluescreen, and since then my netFx is borked. I can't build, and VS finds lots of instances of this error:

Through the VS installer I uninstalled everything Framework and sdk related. Today I reinstalled all those things. Tried to compile, and still have these same errors.

Here's a copypaste form the build output:

0>C:\Users\<myuser>\AppData\Local\Temp\.NETFramework,Version=v4.5.1.AssemblyAttributes.cs(1,1): Error CS1056: Unexpected character ' 
1>C:\Users\<myuser>\AppData\Local\Temp\.NETFramework,Version=v4.5.1.AssemblyAttributes.cs(1,1): Error CS1056: Unexpected character ' 
4>C:\Users\<myuser>\AppData\Local\Temp\.NETFramework,Version=v4.5.1.AssemblyAttributes.cs(1,70): Error CS1056: Unexpected character '
6>C:\Users\<myuser>\AppData\Local\Temp\.NETFramework,Version=v4.5.1.AssemblyAttributes.cs(1,1): Error CS1056: Unexpected character ' 
2>C:\Users\<myuser>\AppData\Local\Temp\.NETFramework,Version=v4.5.1.AssemblyAttributes.cs(1,1): Error CS1056: Unexpected character ' 
3>C:\Users\<myuser>\AppData\Local\Temp\.NETFramework,Version=v4.5.1.AssemblyAttributes.cs(1,1): Error CS1056: Unexpected character ' 
5>C:\Users\<myuser>\AppData\Local\Temp\.NETFramework,Version=v4.5.1.AssemblyAttributes.cs(1,1): Error CS1056: Unexpected character '

I use VS2017. Tried VS2019 (Community) because why not, but it has the same problem.

Any idea what else I can try, before uninstalling and reinstalling everything related to visual studio and netFx?

Maybe you're missing one of those framework-or-sdk-related installables? Feel free to check: https://stackoverflow.com/questions/46744973/how-do-i-repair-vs2017 — Héctor Álvarez, Nov 28 '19 at 08:21
Actually it only happens in net451 projects - other versions dotnet core work. — Squirrelkiller, Nov 28 '19 at 08:24
@PavelAnikhouski I did two things, but most probably deleting the temp files did the trick. Post that as an answer, then I'll accept it :) — Squirrelkiller, Nov 28 '19 at 08:59
@Squirrelkiller this is actually a duplicate with the question, which I've mentioned above — Pavel Anikhouski, Nov 28 '19 at 09:03

"Unexpected token" within .NET Framework

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