My laptop was infected with viruses and Trojans that shut down my system and corrupted Win32system. I set ATI driver, Intel PROSet, and ATI video drivers from CD as my Compaq is a 2002 version. Everything seems to work except the scroll on the USB mouse seems to turn off and on and select button is weird with clicking. USB mouse model: Aspire ball mouse or Imation optical (800 dpi) Might this due to a drivers problem? Problem extends to Internet pages, Word, and Excel. Is Genius Netscroll with drivers available on the net a solution? Navi touch pad is okay. If there is a need to install new drivers, please provide a link. 
Troubleshooting Mouse Scrolling Error: Testing the Mouse
If you have access to another laptop or computer, try using the problematic mouse with it and see if it works for you. If it does work with no problems whatsoever, then the problem is more likely with the original notebook than with the mouse. If the mouse does not work properly, then the problem is most likely that the mouse is in need of replacement because it is broken.
One other strategy that you can try is to clean the mouse with the track ball thoroughly. It is possible that the internal area where the track ball revolves is dirty or sticky. If it is, then it would explain the random behavior of the mouse. Use a small amount of rubbing alcohol and a cotton tip to carefully wipe the area inside the place where the track ball sits. Even a small amount of dirt or sticky residue can create a problem such as this.
Check to make sure that the USB port that you are trying to use is compatible with the mouse. For example, if you are trying to use a USB 2.0 mouse in a USB 1.0 port, you aren’t going to get optimal performance.
Troubleshooting Mouse Scrolling Error: Drivers
In all likelihood, it sounds as though you might need to repair the drivers for the mouse. Have you tried unplugging the mouse on shutdown, plugging the mouse in, and rebooting your laptop? Ideally, if the drivers are available, your laptop will load them and the mouse should work. If it does not, then it is possible that the mouse is no longer usable or the drivers need updating.
In order to check for an update on the driver’s for the mouse, you need to have the model number for it. If you have an Aspire ball mouse, then you can visit this link (Aspire) at Acer/Aspire’s website to check for mouse drivers. For an Imation Optical Mouse, visit this link Imation Downloads.)
Genius Netscroll Mouse
The Genius Netscroll mouse does offer the latest in technology, but I would advise you to check to see if it is compatible with your operating system and peripherals before making your purchase. You can visit this link if you want: Geniusnet.
