T61 Keyboard disabled when external USB mouse plugged.

Hi,
I have a T61 with WinXP SP3. Also a Microsoft 4000 wireless USB mouse. If I plug in the mouse too early in the boot process, they keyboard and ultranav stop functioning (probably disabled somehow). The external mouse still works. How to change this functionality?
Thanks!
tls

I use a Microsoft 3000 USB-attached mouse.
I plug the mouse dongle into the USB port BEFORE pushing the Power On switch, and have never had any trouble.
Centex

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