It seems that you're using an outdated browser. Some things may not work as they should (or don't work at all).
We suggest you upgrade newer and better browser like: Chrome, Firefox, Internet Explorer or Opera

When moving the mouse slowly, the cursor hardly moves a pixel. Also, it's really hard to explain, but it seems that when I move the mouse left, for example, the cursor sticks to that X axis and ignores movements on the Y axis, and vice versa, making it really frustrating to use the mouse.

I have the latest drivers for my mouse (R.A.T.9). I installed the patch and Hi-Res things. I disabled UAC. I used -no3d -doublebuffer.

Please, if there's any solution I missed while searching the forums, I'd be grateful for your help.
No posts in this topic were marked as the solution yet. If you can help, add your reply
GOG support did it! :D

"Please try disabling the “enhance pointer precision” option. To do this, go to Start -> Control Panel -> Mouse -> Pointer Options, then make sure that “Enhance pointer precision” is un-checked, and click OK."

Thank you, GOG!!!