Mouse Driver Problem

Computer: Toshiba Satellite 3000 (laptop)
Operating System: Windows ME

A few weeks ago, I had some problems with my mouse pointer. It would start going down, down, down and would never come back up, specifically after touching the little joystick-like mouse called an Accupoint II in the centre of the keyboard or any of the keys around it.

I tried disabling it, so that my USB mouse would work perfectly.

Then getting fed of up of not being able to use the inbuilt mouse, I then went to the Device Manager and deleted the mouse driver and restarted. The driver came back up, but then, suddenly, the Accupoint II stopped working.

I've been using my cheap USB mouse ever since.

However, now the mouse pointer takes on a life of its own. Instead of whizzing down to the very bottom, it whizzes to the extremes of the screen, sometimes going left, other times going right or up or down and sometimes whizzing up and down erratically.

More often than not, the mouse pointer acts as if I've got the left button held down or as if I keep repeatedly pressing the right button, all whilst the mouse pointer moves randomly.

It can't be the mouse, because even after removing the mouse and hence removing its driver, the mouse pointer eventually went on its bizarre rampage.

Luckily it doesn't happen at the very beginning, but only when the laptop's been on for some time.

My laptop is not connected to the Internet. I've scanned it once with updated Avast! Antivirus software and come up with nothing.

Would somebody please help me?

I have a sneaking suspicion that it might be a driver problem, but where can I find the appropriate drivers online?