"preparing to install Microsoft Office" window on Teriminal sever Win2008R2

Hello,

We have a couple of terminal servers (Windows 2008 R2). On that server a couple of people have the right to start MS Office 2007, others don't. The people that don't have the right to start MS Office, have a problem with using PDF Creator. Everytime they try to make a pdf they get a "preparing to install Microsoft Office" window. I resolved the problem by giving everyone access to MS Office, but that solution is very costly. Is there a way to not get the "preparing to install Microsoft Office" window, and not have to pay for the licenses?