the path you have chosen does not point at a qualifying upgradable product. What do I do?

My Office 2007 application won't run. When I reinstall, i get the message " the path you have chosen does not point at a qualifying upgradable product. What do I do? I have both 2003 and 2007 installed. neither is usable.
tfrazier824Asked:
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David-HowardCommented:
If you are using Office XP Students and Teachers edition it is not a qualifying product for the upgrade version of a 2007 Office product.
http://support.microsoft.com/kb/933567
If you are using an Office trial version this may also cause the error message that you are receiving.
Are both 2003 and 2007 full suites with issued license keys?
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tfrazier824Author Commented:
Both are (were) complete installations. Because the 2007 professional is an upgrade, when I attempt the install, I get the no qualifying upgradeble product message. Both programs continue to be in \program files and are referenced in remove programs. They do not respond to change\remove.
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David-HowardCommented:
If you can't uninstall through Add/Remove programs, you might try this.
http://support.microsoft.com/kb/928218
Then reinstall Office 2003 and then your 2007 upgrade.
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