Lately, I got the same error on different clients with Win 7 pro 64.
The error is no. 339 and about MSCOMCT2.OCX beeing not registered.
On all machines, I had to copy MSCOMCT2.OCX and register it. Then PDFCreator worked fine again.
A simple re-install of the the program didn't do it.
Is this a PDFCreator or a Windows issue?
Any good ideas...;-)