[HELP] Locked user files and corrupted drive bin after recent reinstal

Hi guys! So I'm dealing with this nagging issue that I need your help with. I have recently reinstalled Windows 10. Well, technically it was a month and a half ago but during this time I've not used the machine so we can deem it recent. All I'd done afterwards was install some OEM-provided drivers, nothing else.

So, the other day I finally made up my mind to get my hands on it and set up the software. The very 1st thing I begin with is the security/protection software. I've a license for Avast Premium and so I go to the installation stub file but.. turns out it's locked and I've no access to it:
https://i.postimg.cc/CK69y4zV/runasadmin.png

Whether I just double-click or select 'run as admin' it's all the same.
I noticed some 'file ownership' option in the right-click menu:
https://i.postimg.cc/8sg5kFmP/file-ownership1.png

But it doesn't work:
https://i.postimg.cc/sgdcbybV/file-ownership2.png

Sure, I could probably go to Avast's website and download the installation stub again but as you can see there are many other files locked. While some of them may be installation files of software that could be downloaded again others are personal files and I'm not giving up on them because of some sh*tty Windows bug. So I started looking for a way to unlock all the files and came across this article which claimed to offer such a solution:
How to fix 0x80071771 “The specified file could not be decrypted” error?

I diligently followed all the steps, yet not only it didn't help at all, but now every time I access the file explorer I get this nagging pop-up for added hassle:
https://i.postimg.cc/zXskg5ks/E-drive-bin-issue.png

I read somewhere a purported solution to get rid of it was to delete the recycle bin for the specified drive but I'm afraid of losing files and I don't want to do this. Since the reinstallation I've not deleted any file on purpose. When I access the $RECYCLE.BIN on E:\ drive there are some old entries from previous months and years:
https://i.postimg.cc/FHKJzBMM/e-drive-bin.png
I can't open any of them since I get 'access denied' and I have no idea what can these be.

So, good people, do you know a way out of this awful situation so I can gain access to all my files without losing any of them? If I have to, I may reinstall windows again, but what do I do about this creepy EFS feature that is locking my files? It acts like cryptolocker virus, only that it has yet not asked for ransom..