For Vista you will want to try to go to Local Disk (C:)\ProgramData\Microsoft\Windows\Start Menu\Programs\Startup.  See if there is a shortcut to the registration program for the onOne product that is asking you to register.  If you see a shortcut called Register (onOne Product Listed here) go ahead and delete it.

NOTE: If you are not able [...]

If you find yourself in a situation where you need to re-install your onOne Software product, due to a new computer or you are rebuilding your existing workstation you do not have to re-register after re-installing your onOne Software product.  If you are not sure if you ever took the time to register your product [...]

If you find yourself in a situation where you need to re-install your onOne Software product, due to a new computer or you are rebuilding your existing workstation you do not have to re-register after re-installing your onOne Software product.  If you are not sure if you ever took the time to register your product [...]