This is what i found on the internet:
Windows installer tries to install Office 2003
Every time I open any program the Windows installer tries to install Office 2003 - I have uninstalled the program, removed manually form registry. defraged, ran Registry Mechaic and Total PC Heath programs. Turned on the compter no problem. Installed Office 2003 again and error is there again.
Answer:
Do you have multiple versions of Office installed on your computer?
Are you logged in as an Administrator?
Start any Office program as Administrator and see if it helps.
Go the following location “C:\Program Files\Microsoft Office\Office 11” or “C:\Program Files (x86)\Microsoft Office\Office 11” (incase of 64-bit Operating system).
Locate WINWORD.exe, right click on it and click on “Run as Administrator”.
Allow it to finish the windows installer configuration.
Restart Word and see if the windows installer prompts.
If the above does not resolve the issue, install the latest Windows Installer and see if it helps.
http://support.microsoft.com/kb/942288