After upgrading to SW2004 sp2.1 from sp1 in anticipation of a PDF Writer fix I recieved the same error message while trying to create a PDF. Solidworks and CATI were incredibly prompt with an easy solution. From Add/Remove under Solidworks click the Change button and click Repair when prompted...
We have about 25 Solidworks users with a Solidworks network license. In order to maintain consistent installs I used the Installation and Administration Guide to create an Administrative Image. From this image I can install service packs and update the users from this. The guide is very helpful...