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Debugger Mon51 stops to work when upgraded to XP sp1

Hi all,
I had W2k sp4 , and using Cx51 keil tools , on cypress USB Fx2 development board .
Earlier the debugger monitor used to work fine through UART , but ever since i upgraded the Win 2k to XP SP1 , the debugger is unable to connect to the board for debugging .
anyone knows why?
is this a known issue?
any workaround?

regards
Taha