well ..i had to check out again and slooowly to become able to answer your questions
1: it is true, there is Finished installation Window shown...but..
2: Hit its Finish Button, makes popup notice, there is reboot of Comp to be done; 2 Buttons: now or later ?
3: in Case i hit later there is a kind of short (second ?) auto-install running. Saying something like windows is configuring..BMP...too fast to read it all
Seems to be able to do its "install" half way, then stop itself and displayin above missing file message.
Same if i use the now Button, restart PC, the very same Moment Desktop is shown, same kind of auto-install starts up. Thought this is part of Classic Shell install, needed to get it work.
4: Because of been unable to find such bmp.msi i hit that >abbrechen< Button to make that error / search Window to disappear.
5. After that i can see Classic Shell running by hit the Start-Button. If i open its Config a can see: Version Numb. I am told it is 3.9.0.
But: the reason why i was talking about that setting of 3.6.8 backup.xml File is: 3.9.0. is running, okay ..fine.. but at least former 3.6.8 setting of wanted / former used skin is gone. The far i remember: If i go to skin chosin option, inside that running 3.9.0, if i try to change skin away to wanted / former one, that "auto-install bmp.msi not found error message" popups again. And again if i try second time change it. There is no need to close first of those msi-error messages too, do second try to change Classic Shell skin results in an second msi-error message.
6: No, i don't have any other startmenu, desktop adding / changing / coloring / tuning / pump it up software running, this is reason too, i thought that bmp.msi error belongs to Classic Shell Installation.
7: so if i am wrong, if this is an failure done by my windows, i am very sorry i wasted your time
8: no bmp.msi at win 7 setup DVD found
9. no Change if NOD 32 Antivir is temp. stopped.