Using KVM-121 with 2 monitors

Something like this could solve your problem.

You can share a keyboard and mouse and even a monitor with up to 4 computers with one of these KVM Switches

Official 4 Port USB 2 0 KVM Switch Box 4Pcs KVM Cables Keyboard Monitor

If you have two separate computers for different purposes, such as personal and work use, you may find it convenient and necessary to connect both to a single monitor. Many monitors have dual inputs, making such a connection simple. However, you might need a keyboard, video and monitor switch to accomplish this task if the monitor lacks a second input. Dual Inputs
Step 1 Examine the back of your monitor for the presence of dual video inputs, such as a single VGA and DVI or HDMI output.
Step 2 Connect the VGA cable to one computer. Plug the other end of the cable to the matching input on the monitor. Rotate the retaining screws until tight at both ends of the cable.
Step 3 Plug the DVI or HDMI cable into the back of the second computer. Insert the other end into the monitor's digital video input. Screw down the retaining screws if you're using DVI.
Using a KVM Switch
Step 1 Ensure both computers are turned off. Place the KVM switch on your desk where it is within convenient reach.
Step 2 Locate the video output port on the back of the KVM switch. Plug a VGA cable into this port. Plug the other end of the VGA cable into the monitor.
Step 3 Plug the VGA monitor outputs from each computer into the inputs on the back of the KVM switch. Tighten the retaining screws down for each connected VGA cable on the computers and the KVM switch.
Step 4 Plug the keyboard and mouse cables into their respective outputs on the KVM switch. Plug each set of keyboard and mouse cables from their ports on each computer into the matching inputs on the KVM switch. Plug each cable in sequentially to avoid mixing them up between machines.
Step 5 Double-check that the mouse, keyboard and monitor cables leading from each computer all correspond to the right machine. Plug the KVM switch's power cord into a nearby AC outlet or power strip.
Step 6 Turn the computers and monitor on to verify the connections are correct.

Required Items

• VGA cable
• DVI or HDMI cable
• KVM switch
• Power strip (optional)

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Unfortunately, this switch has a dedicated port for keyboard that listens for the keyboard keystroke. You MUST plug the keyboard into the dedicated keyboard port on the KVM switch for the hotkeys to work. I recommend putting the mouse that comes with your keyboard to the side, and using another mouse, plugged into the dedicated mouse USB port on the switch. Not the prettiest solution, but some of those mouse/keyboard combos have some funky hardware!

KVM switch: This is a Keyboard video and mouse switch. It is used to connect multiple computer/servers to the same Keyboard Monitor and mouse. It is typically use in Racks housing multiple servers to swap between server without having to use a Keyboard Mouse and a Monitor per server.
SMC switch: I believe is a brand for Ethernet switches, used to connect computer together in the same LAN.

1. Power down everything
2. Turn on the KVM
3. Turn on each unit

the KVM switch is for using muliple computers on one keyboard, mouse and monitor.

Designed for Dual DVI monitor enabled PCs

DVI-I interface technology supports both digital and analog video signal transmission

Supports PS/2 keyboards and mouse including M/S IntelliMouse, Explorer and Logitech NetMouse

Switches instantly between two PCs

Keyboard and mouse are hot pluggable, eliminating the need to reboot your systems

Operating system independent

Supports high digital resolution of up to 1280 x 1024 and analog resolution of up to 1600 x 1200

Your switch box will need auxiliary power.

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.

Use a KVM (keyboard,video, mouse) switch to connect your 2 computers to this monitor. Then you can also have only one keyboard and one mouse. Connecting to the VGA header with one computer and the digital with another is probably not a good idea and the only way that can work is if your monitor has a built in video switch that can be controlled with software. If that is the case they would boast about it in the user manual and tell you how to activate the switch. VGA KVM switches are relatively in-expensive. Some high end KVM switches will exceed the cost of your monitor.