
Is your Windows 7 installation fully updated and patched? It's likely that you don't have all the updates installed and the driver signing isn't matching the certificate from the registry with the certificate on the drivers as there was a change from "Pioneer Electronics" to "Pioneer DJ." With a mismatch, you can't necessarily install the drivers. You could bypass the driver signing, but then there's a chance you'll need to install them again after a reboot, so you're better off updating.