Have you tried plugging your camera into different USB slot? It seems weird, I know, but when you plug it into a different USB slot, windows will automatically register it as a "new device" and should auto install it.
Does the computer lose connection with the keyboard when you plug it in with it off? Have you tried plugging it in with the camera already on?
Did the camera come with software that you installed? You might want to try uninstalling it and reinstalling it then updating it before plugging your camera back into your computer. You could also try uninstalling any software that came with the camera that you've already installed, and then plug your camera into the computer. You can then use Windows Explorer to view/move images from the camera to your hard drive (or other desired device). This is actually a good method to use, as it cuts out the middle man.
Worst case scenario is that your card is corrupted. I've run into this same situation that you're in now. If (hopefully when!) you get the images off the card, use the camera to "format" the card. If the problem persists, then I would buy another memory card for it. Memory cards are the same as any memory device (like a hard drive or CDRW) and have a "write/rewrite" life cycle. Your card might be at, or nearing, the end of it's life cycle. If you have a second card, you might want to try putting it in your camera and plugging it into your computer to see if another card does the same thing. If not, then you know it's the first card. If it does, then it might be something with either the software or the computer itself (OS or otherwise).
Hope this helps!
War produces veterans, wounded both physically and mentally. They have sacrificed for us.....and it is now our job to help these veterans, as they have already helped us in ways we will never know, in ways that we cannot fathom, and in ways that we take granted every day.