computer help needed

[Batz Kage]

Get a new mouse.

I believe I said I switched out the mouse & the problem still presisted.
This leads me to beleive that it's a software problem.

But also, like I said, when I smashed the mouse into something the problem changed. Which could mean hardware, but then why would the replacement not work either?

Thanks for the suggestions though, but I'm really hoping that's not the only choice I have, I just lost my job 2 weeks ago & I'm dead broke -_-

And to Gubi, yeah man, I tried cleaning it out the first time it 'broke' on me. Then I thought that maybe a piece of that crud fell back in & is hanging on the little sprocket thing. Well, I checked inside it & although I'm not sure where the glob went it's not hung in anything that would effect the vertical movement of the cursor.
Plus, I can't see how that would make the cursor jump around both vertically & horizonally while clicking.

I guess I'll have to try changing out the mouse again & sticking with the other to see if things get any better at all.