Strangest keyboard thing ever[Solved]

I installed a Belkin wireless keyboard and mouse via usb. It setup ok.
Upon a restart an error came that the keyboard was not detected. So i pluged in a ps2 and got it started, reactivated the cordless kb and all was fine.
Untill restart again. Same thing keyboard not found press f1 which of course would not work. So i pluged in the ps2 kb and it was ok. I tried it a few more times and got the same error.
Next time i left the ps2 board pluged in and restarted. It booted normaly the cordless keyboard was found.
So unless there is a ps2 kb pluged in the pc wont boot past the keyboard not found error. Now both kb's are pluged in the ps2 and the usb and both work.
So any suggestions?

Hi anne, did you install the software that came with the mouse & keyboard? BJ

I think i found the problam. In the same room is another belkin about 2 meters away.
Probably a conflict of air waves.
I removed the belkin in questio to another room and it is fine