Canon LBP7210Cdn Manual page 530

(3) Click [OK].
* If a 64-bit operating system is running on the print server, the
download installation for the following client computers on which a
32-bit operating system is running is not supported due to the
Windows restriction.
Windows XP (on which no service pack or SP1 is
installed)
Windows Server 2003 (on which no service pack is
installed)
If you download and install the printer driver on any of the above 32-
bit operating systems, you may fail to install the driver and may not be
able to open the printing preferences dialog box.
Click [Next].
Click [Start].
NOTE
If you are using Windows Vista or Server 2008
The following screen appears. Click [Yes].