Hi Tricia,
PA561401.CAB is part of MS Office 2003 Professional Edition,
mainly some programming support tools if I recall.
If you're getting an error message of some type and you
used the 'Local Install Source' (LIS) file option it's possible
that the LIS is damaged or was deleted either manually,
by a 3rd party disk 'cleanup' utility or by using the
MS Windows Disk Cleanup Accessory and choosing 'Office Setup Files'
Do you have a specific error you're getting or task
you're doing when it asks for this file?
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tricia>>
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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