Answer
You need to install the newest version of MSXML or at least 4.0 on your machine.
MSXML is a collection of support functions that combine XML with programming languages such as Javascript, VBScript, HTML, C++, and many others. MSXML contains predefined tags that help reduce guesswork when using MSXML.
After you have installed MSXML 4.0, copy your old Winpager configuration to the configuration folder and start Winpager.