Touchpad / Mouse Not Tracking
If suddenly your cursor stops responding to movement, your pointing device input may just have been turned off. On many laptops, you can check your function keys (top row usually with a mouse icon) and see if it can be toggled back on. Other computers will have the enable/disable function on a corner of the touchpad.
Other times it can be a Windows update that interfered with the function or a corrupted driver. If you have an external mouse or touchscreen you may be able to navigate to have Windows undo a recent change to try and repair the issue.
If the more basic repair attempts don’t restore it, there may be a physical hardware problem with the computer. We can take it apart and check the connections and order in a new touchpad if necessary.