How to completely uninstall OmniPass

Hi,
I have Windows Vista and am trying to upgrade to Windows 7 but Vista will not allow me to do it and gives me a message saying I have to uninstall Omnipass from my computer.
Now I don’t know what or where the software is. I tried the Control Panel and could not find it and I also tried the program files folder and the device manager but both were of no help.
Can you tell me where this software is so I can uninstall it and upgrade my computer?
Between, I also ran a full virus scan on my computer and it came up clean.
