Optical mouse began to act strangely. What can be done?

Question

Suddenly my mouse began to behave in a very strange way: it doesn't draw strait lines as it used to do before whenever I moved the mouse more or less straightly, and also the cursor began to move by itself when the mouse remains immovable. Is it a virus? What should I do?

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Important Addition:

It's an optical mouse

Answer 1

Have you tired swapping out the mouse for a known good one?
If this solves the problem then the best solution might be to buy a new mouse.

Answer 2

Probably it's just a mouse malfunction and not a virus or something like that.. May be try to reinstall drivers..

Answer 3

Have you changed your mousemat recently, or installed another optical device?

Answer 4

Make sure that there is no dust or particles inside the optical hole under your mouse.

Answer 5

Hey even I got same kind of issue. Its because of faulty mouse, I replaced the mouse and it is working fine. Is this mouse from local company, with low cost? In my case it was.

Answer 6

Are there any bluetooth adapters plugged in? Those could be receiving bluetooth signals from a nearby device.