First thing I would check is the power management on the USB's in Device Manager. Make sure this is turned off.
Also, have a look to see if there are any new drivers for the USB available from the manufacturer. I've seen this kind of problem before on XP and updating to the latest 2.0 drivers has resolved it.
Another thing to try would be to swap the cables from the KVM to make sure it's not a problem with the Belkin as well. As all is working in the desktop but not the laptop it could very well just be some duff cables.
Keyboard-Video-Mouse over IP.
It can be implemented in a KVM appliance that has the ability to forward console sessions to a remote computer, usually in a web browser -- you browse to the KVM, click on the server you want, and you have remote control of the console. True console, in that you can interact with the computer while it is booting exactly as if you were in front of the machine.
More recently, some Lights-out-management cards built into enterprise-class computers sometimes come with a KVM-over-IP implementation built in, so you don't need a separate appliance to get true remote control. HP offers the iLO (although usually the KVM functionality is a increased-cost option) and some Sun X series have the iLOM (I am thinking of the X2200-M2, of which I have a dozen or so).
Of the two (appliance or built-in management card) I prefer the latter, because usually they come with remote power controls as well so you can power cycle a computer remotely even if it is totally hung, then interact with the BIOS or RAID cards or whatever on the way up.
Personally I'm getting spoiled -- my attitude is that if I have to go down and touch hardware, something better be physically broken.
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