I have spent the better part of a day researching this for a client in an RDS environam,ent with multiple versions of QB installed.  The fix for this used to be running the serivces as the Local System Account. This has been the fix for years and this no longer works.  The reason why is because the first time a user opens a version of QuickBooks, EVEN IF THE SERVICE IS RUNNING FINE, QuickBooks will check the service and reset it back to using the QB user and revert all the settings.  The program will then work fine UNTIL any user opens a different version of the same year (Premier vs Enterprise).  At that point it will try to check the service again and screw up. The issue is QuickBooks is trying to reset up the service on launch, so what ends up happening is the service is then left in an unusable state until an admin logs in and fixes it.  

I am currently trying to figure out a way to allow the user to let this application do its thing without giving them admin priveleges.