HP 4650hdn "not connected" using USB

I replaced my HP 4Plus with a HP 4650hdn, it´s connected to the PC with a USB cable.

As I use both OS, XP 32bit and Vista 32bit, on the PC, I want to install the printer to both OS as I had installed the HP 4Plus to both OS before.

I downloaded the "HP Universal Printer Driver for Windows - PCL 6" that should work with XP an Vista, installed it to XP an the printer works fine (so my USB-ports, the cable and the printer work).
I started to install the same driverpackage to Vista without any error shown during that procedure, but I cannot send any data to the printer at all, the printer is marked "offline" at the printer settings after finishing the driver installation (I could not print the testpage at the end of the installation). The online help from HP conforms this with the message, that the printer is not connected to the PC (but it truely is, otherwise the printer wouldn´t be able to work with XP).
If I try to print a document I get the error message, that "the selected Printer "HP Universal Printer v4.7 is not a supported HP printer" and after this the windows error code for an unfinished process 0x00000006.

I used the same settings for Vista that I used for XP.

Does anyone have an idea?

Thanks in advance.

After a lot of support by HP I´ve been able to get the printer working with Vista as long as it´s connected by LAN. If I try to change to USB-cable (yes, I changed the type of connection is the systems configuration, too) the printer is still not working.

The Universal Printer Driver for Windows v4.7 PCL6 doesn´t work with Vista though HP claimed it works, but the normal one does fine.

I love my XP more and more - and I´m hoping things get better with Win7.