Here's an important thing - make sure you downloaded NET COMPACT Framework 3.5 Redistributable.
DL it here incase you got the wrong version :
http://www.microsoft.com/downloads/d...displaylang=en
The version I downloaded (the link above) from MS's website is a Windows installer package. You run the installer from Windows (while your TP is connected via ActiveSync to your PC) and that installs .NET on your TP through ActiveSync.