Did you do use an Upgrade Install (from 2003), remove 2003 & install the full version of 2007 or did you install 2007 without removing 2003?
If you used an Upgrade, then I would try a repair install. Go here
and try Method 2 first and then Method 1 in the middle of the page.
If you installed clean, you need to make sure that all traces of Office 2003 are removed from your computer. Let me know if you need assistance with that.
Edited by I_am_CanadianEh?, 11 December 2008 - 11:55 AM.