I need an urgent response so my points given are generous!
I've come accross this problem a few times on different machines and have not been able to find a solution. Once I've downloaded the new Windows Defender it doesn't allow me to install, it displays this error message...
Windows defender requires Windows installer 3.1 or later. To view a list of all installation requirements , visit Microsoft website. http://go.microsoft.com/fwlink/?LinkId=63848
The machines I have worked on where this problem occurrs meet the minimum specification. This problem occurrs even though I have installed a fresh copy of genuine Windows XP with SP2 + online activation. I have downloaded the Windows Defender from the Microsoft website everytime, and you know that requires Windows verification before you can download. I have no problems until I try to install.