Repackaging with sub msi's - ICE33 errors

[b737_800]

hi there.
I am repackaging an application.
Within the application itself there are five subfolders,
three of which contain an MSI each.
I know that trying to repackage an installation that contains MSI's can
create ICE33 warnings - i could be wrong though.
The thing is, when i repackage the app and create the msi and then
run it it seems to install ok.
But, when i click on one of the programs that have been 'installed' i receive
the standard windows notification that it cannot open the program as it cannot
associate and exe file to run this particular program.
Also the icons are missing for all the sub programs associated with this application.I have a sneaking suspicion that the programs and associated icons for this entire application are contained within the three sub MSI's.

Im looking for some advice on what you deem the most prudent approach
for repackaging this app that contains 3 sub MSI's.
I would really appreciate any help you can give me,
Thank you very much and have a good evening.
Regards,

[datastream]

and i'm by no means an expert, dependant on which packaging app your using, could you not snapshot a clean machine, then run each msi in turn, letting then install, then do the after snapshot, thus giving you the difference and just one msi for there apps, or would it be incorrect of me to assume that you want the users to have all 3.