Cannot Add 32 bit Drivers to 64 bit Print Server

Hi Guys

I am following this link:

http://support.microsoft.com/kb/979385

However,  I cannot clear the x64 Type 3 - User Mode, when adding the additional 32 bit

Hence, when I leave the x64 checked and check the x86, I get an error in the end saying my driver is inappropriate for this processor architecture. I believe is caused by the x64 Type 3 - User Mode being checked.

Any Ideas???

jk