Prevent Themes From Changing Desktop Icons in Windows 7

Lock down the desktop icons during theme change
Right-click on the Desktop and choose Personalize
Click the Change desktop icons link in the left pane
Uncheck the following option and click OK
Allow themes to change desktop icons

Lock down the mouse pointers during theme change
Right-click on the Desktop and choose Personalize
Click the Change mouse pointers link in the left pane
Uncheck the following option and click OK
Allow themes to change mouse pointers