Ok,this happened to me about 3 weeks ago. And at this stage I think i tried everything i can think of.
SOME programs just don't start,blink for a second and that's it.If repair the installation or do reinstall it works but after closing same thing happens again. Only clue that sometime prior i installed .NET2 and at some point msxml installation had to be repeated.
tried:
1)Ran - McAffee stinger, adaware,went through hijackthis-log,turned off DPE,uninstalled ZoneAlarm.
2)checked exefile values
3)Updated Nvidia drivers,removed epson and hp drivers.
4)updated msxml,it was failing, re-tried a couple of times, found some solution about using gupdate this and
5)nvidia gave me a freezing desktop (massacred registry,regarding permissions,etc - reinstalled SP2 instead of the original disk(coz last time i did that i eventually ended up reinstalling the whole lot).
6)got shexview.exe, checked if there are any hooks conflicting or something at some point pretty much disabled everything.
7)found somewhere that Java 6.2 can cause something similar and that installshield depends on that, re-installed that and .NET2 for a laugh as well.
Still nothing.
I am kind off running out of ideas,bu t i'm coinvinced and don't know why, that the problem has something to do with installer.
If someone could throw a suggestion at me, I am all ears.