The scroll wheel icon gets stuck on the screen in Window 7

Click start button > Type "Mouse". Now go to the pointer tab , Click on the arrow under "Schemes" and apply "Windows Aero(System Scheme)". Finally uncheck the box in front of "allow themes to change mouse pointer" .

This should work for you.

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):

https://answers.microsoft.com/en-us/windows/forum/windows_10-other_settings-winpc/touchpad-scroll-icon-stuck-on-screen-after-windows/cfb19413-a853-471c-9087-a0c2cf979068

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.     

Try Ctrl+scroll(tried two fingers in my case)