Mouse pointer speed slowed dramatically

I'm well aware of the pointer speed setting under Mouse Options in the Control Panel (interesting point about that later), but it's not something I had messed with, and isn't something I could have accidentally messed with this morning.

Nevertheless, my pointer speed dropped to a noticeable degree. Motions which once swept the pointer across the screen only do a little less than half.

However, when I went into the Control Panel > Devices AND Mouse Settings, I found that there were no options for pointer speed or acceleration. I noticed an "advanced mouse options" link in the Mouse Settings page, but when I clicked it, I got some sort of error about some necessary file not being located where expected and asking me to browse for it, which is silly, since I have no idea what it is.

Please help? There's no way I can play games with the mouse as-is.

Fixed my own issue. It was a display thing (Windows was recognizing a monitor that was no longer connected)