The Compatibility Pack just adds some features to Office 2007 to allow it to work better with files from previous versions of Office. You need to re-install the base Office 2007 applications and then re-install the Compatibility Pack.
Your system should have a folder where the pre-installed applications install programs can be found.
If you can't find. Try this link to get a new ISO (burn to disk) and reinstall.http://forums.mydigitallife.info/threads/22621-Microsoft-Office-2007-%28Official%29-Direct-Download-Links