Hi MLardé,
FSUIPC and SimConnect at the same time is no Problem, some Addons use FSUIPC some use SimConnect and i bet there are some Addons out there able to use both.
The error seems to me a redist problem, so maybe there is a redisturbable thing missing? I´m not sure about that, but i had some problems with that and after i reinstalled some redist packs it is working now. Before some installers gave me a lot of errors, but noweher was explained, that you need the redist ...bla bla... x86.
I hope this could help you a bit.