If you primarily use an external USB mouse and do not want to deal with troubleshooting the touchpad right now, you can stop the error message from popping up by disabling the file at startup.
Corrupted drivers are the most common cause. synaptics.exe bad image windows 7
The most common cause is a corrupt driver. Reinstalling the official driver from your manufacturer is the best solution. If you primarily use an external USB mouse
Check which versions of are installed.