My Windows 7 install has a strange problem where sometimes the scroll wheel icon for the mouse gets stuck on the screen. It's hard to explain in words, so here's a picture (it's in the blank space on the right side, halfway down the screen).
Unchecking "allow themes to change mouse pointer" did not work for me. What did work on the other hand was the following solution (for Synaptics touch pads):
run regedit, navigate to HKLM\SOFTWARE\Synaptics\SynTPEnh in left pane, right click SynTPEnh, select New/DWORD Value. Name of the new key should be writable, Name it: UseScrollCursor , value should be zeros at default, no need to change (in my case). (Credit: Mr JGR)
Then I rebooted my computer and the icon was gone.
This happens for me when, in the same time, I scroll with the Touchpad and move my mouse around (but only on specific softwares).
None of the permanent fixes above worked for me (Windows 10) (adding
UseScrollCursor in regedit + changing shceme) but I can at least remove the stuck icons, each time it happens, by restarting the process
SynTPEnh.exe in Process Hacker
It's not a permanent fix, but it works.
If you don't have Process Hacker and you don't want to install it:
Synaptics TouchPad, right-click and select open file location
Synaptics TouchPadand select