[Google-Desktop] Help on plugin installation

Hi

I just installed GDS 2 on two of my computers and tried to intall some
plugins for the side bar. However, many plugins cannot be loaded on
both machines, including digiWatch, Movies, Calendar and Calculator.
All of them were installed sucessfully, but could not be loaded by GDS.

Any ideas on how to solve this problem? Both boxes are WinXP SP2.