XP, KVM and Scroll Wheel

I have a problem with a desktop running XP Pro and a laptop running XP Home. Both are connected to a Belkin KVM switch, along with a couple of other systems. After switching away from either XP system, when I switch back, the mouse scroll wheel does not work. If I reboot, the scroll wheel comes back. This doesn’t happen with either of the two Win 2k systems.

I’d appreciate any fixes. I’m getting tired of rebooting.