hi joreg…
pdubost has the same problem on his machine than me.
from what i read, it sounds and MATCH exactly troubles i had :
if i make a clean, its says its cleaned and uninstalled, but vvvv works correctly ! ( a way to repair my installation and make text(EX9) working again, but not to fixing system and things of .NET hidden in windows )
for now of my poor experience and situation ( still having sames troubles, but doing with it )i would say:
-visual redistribuable dll is not the expected one in pdubost machine, and is conflicting with installation of several software, un-unabling there install, such as Quicktime
-maybe pdubost has all the time an updtodate wich is never succeed when he close his windows7
If its this, pdubost has no choice than reinstalling completely windows ( wich i cant do as i didnt make the 4 restauration dvd !!!)
cheers