Well, first of all, seeing what you described in the first thread - the install was wrong.
USB devices prefer that the software is installed WITHOUT the device attached. I would suggest the following -
1 - Go to your Printers and Fax file in your Control Panel. If you find the LJ3050 listed, right click on the icon and select DELETE (yes the computer may warn that you would be deleting your default printer - go ahead).
2 - Reinstall the software WITHOUT the printer plugged into the USB (This means even if the power is off on the printer - there are sometimes things that run even when the power is off).
3 - Once the install is complete, or the install asks for the printer, THEN plug in the USB and turn on the printer.
Good Luck!
A-N