Uninstalling a .msi package

> Uninstalling a product, the message is "The system administrator has set
> policies to prevent this installation". The only way i found is
> relaunching
> setup.exe with "run as administrator", then selecting "remove the
> program".
> May be i have no more the CD with the setup.exe to run as administrator,
> so
> uninstalling is no more possible.
> Any idea?
> Thanks, Stefano.
>