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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?

Important Addition:

It's an optical mouse

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Is it an optical mouse? – Tog Nov 29 '10 at 13:23
Ah, I am sorry, forgot to say, yes it's an optical mouse. – brilliant Nov 29 '10 at 13:30
Is it a wired or wireless mouse? – ChrisF Nov 29 '10 at 13:48
up vote 2 down vote accepted

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.

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I just tried another one (it's also an optical one). Another one is also drawing strange lines, but the cursor doesn't try to "creep" by itself. – brilliant Nov 29 '10 at 13:31

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

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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.

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

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No, there aren't – brilliant Nov 30 '10 at 5:21

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