Vanishing mouse pointer/ pointer getting stuck

[viswanathan]

My old P III home PC is still working well but for some minor problems cropping up now and then.

The pointer of the mouse sometimes appear with a black square shadow and I am not able to change it to normal pointer mode.

The pointer gets stuck up and does not move whatever be the command.

The pointer suddenly vanishes.

For the last two situations, I have to restart; but scan disk comes through after which it works.

PLEASE TELL ME SOLUTIONS
Viswanathan