May need Net Frameworks 3.0 to allow it to install (guessing).
Some error message appears when I try to open gadgets!
Some gadgets require the .NET Framework to be installed. Try this: Press Win+X, select control panel, search for "Turn Windows features on or off" and select everything with ".NET" in its name. Press OK.
Mine always worked as I already had to install NF 3.5 for another program I use to manage shortcut icons etc and I do this right after clean install so by time I get round to installing Gadgets it all works.