Office 2003 Professional Edition contains all of the
programs in the Office 2003 Student/Teachers (Standard)
Edition. There isn't a need for both on a single computer.
The 1608 error is from using an Office Professional upgrade
edition. Upgrades only recognize an earlier version of
Office, not one in the same (2003) series.
http://support.microsoft.com/default.aspx?scid=kb;en-us;832288&FR=1
If you have an earlier version of Office or another qualifying
product either installed or on CD then you may be hitting the
problem listed here.
http://support.microsoft.com/default.aspx?scid=kb;en-us;315995&FR=1
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When upgrading from Office 2003 Student to Office 2003 Professional, I get
error 1608. Office 2003 Student appears to be installed correctly, I can use
the various programs. I am re-installing both programs because I had to get
a new hard drive. I am using Windows XP Home Edition. >>
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Let us know if this helped you,
Bob Buckland ?
MS Office System Products MVP
*Courtesy is not expensive and can pay big dividends*
Office 2003 Editions explained
http://www.microsoft.com/uk/office/editions.mspx