A family of Microsoft word processing software products for creating web, email, and print documents.
The measurements you've given for the vertical pitch and horizontal pitch must be wrong -- each of them is as large as the entire page dimension. The vertical pitch (as shown in the Preview picture in the dialog) is the distance from the top of one label to the top of the label immediately below it. Similarly, the horizontal pitch is the distance from the left edge of one label to the left edge of the label next to it. Typically these are just a millimeter or two larger than the corresponding dimension of one label, not of the whole sheet.
Measure the distances on an actual label sheet and enter those.