Hello,
The upgrade from 6.2 to 7.2 is not a supported upgrade. I would do a fresh install, export the objects from the old SIM and import to the new one. You can export with mxnode.exe, this can create a text file to use for populating the new server. Then use the old SIM server if it has credentials like a trust to set a trust for your new SIM server and then do a replicate from the server with 2 trust to your other servers. This way if you have a trust on your new server you csn procede with setting other things like snmp security and traps, VCRM etc...
