Windows 8 non-admin won't install Ricoh C3001 drivers

When I try and install the Ricoh C3001 on a Windows 8 machine I get:

Do you trust this printer?

And then:

Do you want to allow the following program to make changes to this computer?

The Windows 8 machine is 64 bit, the print server is Windows Server 2008 32-bit.

The Windows 8 machine will install the RicohMP 2352 no problem, which makes me think there is a problem with the C3001 driver on the print server.

Is it because it is non-signed?

Thanks,
Alex