If your Revolutionpack 7 hangs during install, AFTER extracting files, i found a way getting it to work:
You see "extract - ended" or something similar to this. Close it, and press OK in the error message from the setup.
In the revolutionpack folder, you go into the directory "Lame"
Right click on install.inf and click on install.
Wait till its finished and then doubleclick on Slayer.reg and themes.reg and confirm install.
Reboot and choose your design. (Desktop->right-click->settings)
Click on apply, and your wonderful style appears. This DEFINETLY looks great!
Greets
Oerg