Quartus II DE2 board is not detecting my USB blaster!!!

Regarding your message above, I can unplug/plug my DE2 and see it appear in the device manager. However, when I try to assign a driver (per Altera instructions and pointing to C://altera/11.1/quartus/drivers) I get the message "Windows found the driver software for your device but encountered an error while attempting to install it. The hash is not present in the specified catalog file." I can not upload my design as the quartus programmer does not see my device. I installed the software directly from the CD that came with the board. Please help!