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I can confirm the same problem happened with me just now. I have TrendNet USB/KVM TK-207 and was flawlessly working with Logitech K260 Wireless Mouse and Keyboard Combo, but today on both computers all I can see is the error:
. USB Device not recognized - The last USB device you connected to this computer malfunctioned and Windows does not recognize it.
I unplugged the usb wireless adapter and connected it directly to the PC - it worked like a charm again. I have tried to connect the wireless adapter to the mouse port hoping that the keyboard USB port is causing problems, but all I got was the same error. I have tried to conect a normal USB keyboard, but again the same error I get for both - the mouse and keyboard, so it is more than obvious now that the USB ports of my KVN Switch are malfunctioning. I will try to leave it for a while if it got hot somehow as it was connected for more than 6 months working perfectly fine, but if not, I am heading to the store for support/replacement.
As far as mouse is concerned all you need is PRACTICE, and there may be a compatibility issue with your keyboard or the wire you are using is not fine, coz the kvm switch is definitely ok when used with 2 systems.
The GCS632U has keyboard and mouse emulation that may not work with all wireless combos. If your wireless combo is going to work the single USB connection would need to go into the keyboard port as that is the only port that will recognize the hot key switching commands. If the wireless combo still has problems then try using a USB wired keyboard to ensure the GCS632U is working correctly.
Your problem has nothing to do with the Operating System (Vista), it has something to do with the brand of your computer. I have similar problem before, I have Vista (Dell), but the time I connected another Vista (Sony Vaio), everything worked correctly.
This is what you need to do:
1. You have to make sure that you are using a standard USB keyboard and mouse.
2. Connect first the keyboard and mouse directly to the Vista computer to see if the USB ports of your computer are working properly.
3. You may power cycle the KVM switch by disconnecting it from the computers (including the keyboard and mouse) and leave it disconnected for 2 minutes.
4. Reconnect everything after two minutes and then reboot the computers.
5. Try using different USB keyboard if problem exist after power cycling the KVM switch.
Buy a usb hub and an usb extension, so that you can have 4 or 6 free usb at the front of your computer, and you can switch devices using usb rather then the mouse converter . Using the converter on mouse and keybord make easier for the plugs to slip out, and usb is better. Note some usb modem and some other device do not support usb hubs, you have to plug them straight into the free computer plug , if you have any.