Mouse "freezing" for no apparent reason

Hi there,my mouse is frequently freezing,at any time,and I have found out
that,if I hit a button on my keyboard,that says Stand By,the computer will
go to Stand By,and the mouse will come back to life when I reactivate the
computer by hitting the same button again.
Thanks for any ideas

Alberto

My computer:Dell,Pentium4,1.9 Ghz,512 RAM,160 Gb hard disk,high speed
internet connection

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