I'm not sure what those bottom two files are, I suspect they are related to some windows internal copies or similar process. I have one on my system from R 4.0.4, which I just installed.
I am just using the default 64-bit installation. Note that I generally don't install the 32-bit version of R. I'm not sure I've ever needed it, and I had one program that kept defaulting to it. Therefore, I just don't install it.
I guess I would recommend you completely remove both RStudio and all R versions you have. Then reinstall again, as the same user, installing R first, then R. You could probably add a reboot in there after the uninstall, just to make sure everything is cleared out of your systems memory. If that doesn't fix things, I'm at a loss.