I had a similar issue, however I never received notification that certian items werent being installed, instead the programs would not apply full themes, skins, ect. and would show some aspects of the program as simply not installed.

What solved the problem for me was to uninstall impulse and all object desktop programs, then reinstall impulse BUT right click impulse icon to run as administrator for the first time. install all programs from within impulse and you should be okay....hopefully.

they have said they have tested vista and uac accounts to make sure this is not necessary but it still seems to be necessary for some reason for some users.