I have a new (just over a month) Compaq Presario PC. I loaded both Windows Word and Excel 2003 and had used them both for a month or so. My computer Guru helped me get further setup with the new computer. We removed the existing new Word and Excel as I was used to the 2003 and preferred to stick with that. Later in the evening when I tried to open Word and the error notice came up - error 25901 - SKU112CAB. I tried opening Excel with the same results.

Lowell Aspelund

You need to reload the 2 programs all over again as you said you had them removed by Mr. Guru.

Time to call your computer "guru" and get him to reinstall Office as I bet he didn't leave a copy of the install media.
This is a well know error with Micro$oft Office.