Carlos82,
Another thing to check concerning the pdfmaker.dot is within Word itself. Open up Word just to a blank document.
Then click Tools, Templates & Add-ins.
On the Template tab, look to see if pdfmaker.dot is listed under the Global Templates & Add-ins section. If so, click once on it and then click the Remove button. OK out of the Templates & Add-ins window, exit word and then try opening the document giving you the problem.
If that doesn't work and you still are getting the error when you try to open the document, the document may have some corruption in it.
If that is the case, and you are using Word 2003, when you click File, Open and highlight the document giving you the problem to open it, you will see on the right hand side of the Open button a little arrow. Click on that arrow and try choosing Open and Repair to see if that corrects the problem with the document. You may want to save a copy of the original document in another location before doing the above just in case it wreaks havoc with the document when you do the Open and Repair.
Hope this helps.....
dodomfcg.