First, you might want to check out the shortcut that launches the bar. It should look something like this "X:\Program Files\Microsoft Office\Office\MSOFFICE.EXE" where X: is the drive you have Office installed. There should be no switches following the line, and the 'Start In' directory should be the same.
Second, go to the above directory and look in the sub-folder "Shortcut Bar". Delete any files you find there, especially *.tmp ones.
Third, look in the sub-folders of that one which should contain names such as "Office" and "QuickShelf", etc. Verify that the shortcuts contained there are properly pointing to the applications, and that you can launch them from there without the quickview problem.
If the links launch properly from there, you might have a registry setting for files of type .lnk (lnkfile) that is pointing to the quickview.exe application on "OPEN" and then explorer is taking over after you close that window and running the proper application. To fix that you will either have to follow the .lnk path through the registry until you find the class that is servicing it (under a class id you will find something like "Server/Open/" and a key that points to the program it is supposed to launch and change it from quickview.exe to explorer.exe (I think, I'll have to check on that). You can verify the proper service to run by looking at the same key on a properly functioning machine.
I noticed on my system that when I un-installed quickview, it left the .exefile on the drive in the "viewers" folder. You can rename/remove that file also.