Does it occur with every Word document when opened? If so, right off the top try this:
* See if it is a problem with compatability with your printer driver.
* Also try to renaming or deleting the normal.dotm file and let Word recreate a new one automatically.
The following web page discusses these 2, which are the most common issues:
http://support.microsoft.com/kb/826862I also discussed this with a user on the MS Community Forums and it worked (in his case it was a printer driver). It could be that AC uses MS Office 2003 which works with a non-compatible driver with MS Office 2007.