USB conflict

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My m.b. is ASUS P4VP-MX and have 2 USB.
One is always  connected to a wireless kb/mouse (PS2 still connected).
Whereas the second USB is used for digital camera downloading.
System performs nice, but when digital camera is connected the USB KB/mouse
stop working and I have to use the PS2 alternative.
Why both USB can't work simultaneously?
Some settings are wrong?

Thanks for any comment

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