Hi Jack, thanks for contacting me to help you. Well, I have few questions since you didn't specify anything in detail; What is the operating system installed on your computer? e.g. Windows xp or Windows vista or Windows 7.... What antivirus program is installed on your computer?
Still have questions, but let's proceed anyway. I don't think this it will be a good idea to set up remote connection and most of all, it looks like we are in different time zones (I am in India).
Please follow the instructions given below:
Hardware; For hardware issues, please try to install another mouse on the same system and check whether the same problem persists or not.
If your mouse has a driver, please uninstall and reinstall it.
I would also suggest you to place the mouse on different mouse pads, never place on table or on a plastic type surface. This is to verify that there's no hardware issues.
Software/Virus;It would be a pleasure if you could let me know when and how it happened. In most cases, it hardware issue, but in rare cases, viruses cause this problem. Make sure to scan your computer using different types of antiviruses. But remember not to install multiple antivirus programs at a time. If you've finished scanning with Avira and the problem persists, then uninstall it and then again download and install Avast. Download Links are given below. Malwarebytes is also a recommended program for the same problem. I hope you can still install programs or run .exe files.
I would suggest you to scan your whole drives/computer in Safe Mode. With Avast you can even Scan in Boot Mode means during startup...
The following are the download Links..Avira FREEAvast FREEMalwarebytes FREE
Let me know if you need further help..
Note: All Programs I've mentioned are Free Versions and of course approved softwares, once installed, don't forget to update before running the scans.
Thanks for using FixYa