The best way to resolve printing issues with Dexcom Studio is to first make sure you have the appropriate file association for a program capable of viewing and printing .doc files on the PC.
Once you have associated all .doc files with either MS Word, MS Word Viewer, OpenOffice or LibreOffice, select View Report from within Studio.
This save a .doc copy of the report on the C:\Dexcom\Dexcom Studio\Temp folder. From here, double click the file and it should open in your default document viewer. From there (depending on the viewer you're using) you'll be able to print and save your reports.