In your screen snapshot, I noticed that the Font Name box is empty/blank, but the Font Size box is not empty/blank. This may be caused by not having a default printer (or the proper default printer) installed on your system (along with the proper driver for that default printer).
Even though you mention that Word and Excel work fine, you might just try the Print command in PowerPoint 2007 to see what it is using/seeing as the default printer.
And then there is this somewhat related thread:http://www.themssforum.com/Powerpoint/Powerpoint-misaligned/
You might also try clicking the Office Orb in the upper-left corner, click the PowerPoint Options
button, click Resources
, then click the Diagnose
button ("run Microsoft Office Diagnostics").