Hi
Multiple instances in V7 should be run from a single installation, but with separate profiles. I suggest backing up any trigger files etc., uninstalling all copies of the program, and re-installing one installation with the default location, settings etc. Test that installation works OK. Now add a new profile to that installation, and test again. It should work OK.
Although there are some problems in recent versions, mcbee for example runs 21 instances from a single installation.
Hope this helps.