Final answer:
Installing the 32-bit version of the printer driver on the workstation is the most likely solution to the problem.
Step-by-step explanation:
The most likely solution to this problem is to install the 32-bit version of the printer driver on the workstation. Since the users running 32-bit versions of Windows are unable to install the driver for the shared printer, installing the 32-bit version of the driver on the workstation would allow these users to use the printer without any issues.