Why Excel does not respond when I right-click .xls file and try to convert it to PDF? Kolas Hemek August 21, 2014 03:21 Updated This error is caused by Office XP, not PDF Driver. Please download Service Pack 3 of Office XP from Microsoft website. Related articles How do I find my serial number? Why do I run into "Valid License not found"? My driver cannot convert Word and Excel file, and I can't see .doc and .xls in the "supported file format" list. Does Gaaiho PDF Suite support terminal server? How to find the missing Gaaiho toolbar/add-in in Word? Comments 0 comments Please sign in to leave a comment.