Mate, it's a hair!
Just take the roller cover off and pick out all of the grime, dirt and hairs from the ball and the rollers. Clean the ball with washing up liquid and it will be like new.
BTW: Most mice don't have roller balls and instead use an optical infra-Red eye. This avoids the problems you are having and also means that you don't need a mouse mat. A new mouse will be very cheap and save you a lot of frustration. USB or PS/2 doesn't really matter. Over 90% of them are now USB and it will mean you will be able to use it in the future.
PHEW.....JUST MADE IT............................. UP"
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