First, before making the registry change below, you should download and install Microsoft's updated Windows Installer 4.5 (KB942288-v3) from THIS LINK for Windows XP 32-bit, which is what we assume you have. (The MS article that explains this updated installer is HERE.)
Next, copy the text given by @Sebijk (below) to notepad and save it as POSReady.txt
Make sure what you copy starts with the "Windows..." line and has two blank lines after the line that ends in "00000001"
Rename the fil