Did you install the drivers for the cable before you connected the phone to the computer? Is the phone turned on? Is the cable plugged in completely to the PC and your phone?
I don't want to assume you now all of these steps, but those are the easiest ones you can troubleshoot without looking at the computer itself.
If you didn't do the first one, you'll probably have to remove the incorrect drivers before the phone will be recognized. I have no idea which ones they'd be...
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Did you install the drivers for the cable before you connected the phone to the computer? Is the phone turned on? Is the cable plugged in completely to the PC and your phone?
I don't want to assume you now all of these steps, but those are the easiest ones you can troubleshoot without looking at the computer itself.
If you didn't do the first one, you'll probably have to remove the incorrect drivers before the phone will be recognized. I have no idea which ones they'd be...