Growing up using a PC that ran on Windows 3.1, I don't think it ever occurred to me that there was a Windows 2.1. Or 1.0. That was just Windows, until Windows 95 came around a few years later. But ...

With DarkSoulsMouseFix, which just entered a 1.0 beta status, those problems are solved. Here’s the feature list for the initial release according to the download page: True raw mouse input ...