may be this way,
For Server 2012,
1. Open command propmt
2.write gpedit.msc and open it
3.Go to computer configuration -> Administrative Tempalates -> Wondows Components
->Remote Desktop services -> Remote Desktop Session Host -> Connections.
4. Here Disble the below mentioned.
Restrict Remote Desktop Services user to a single remote.....
NOw goto command propmt and update the group ploicy using below mentioned command.
Goto command propmt and type -> gpupdate and enter it. it should be successfully applied.
I think this will not effect your users.
The QlikView Windows Services will need changing to a new AD User that belongs to the same Local Groups as your current Local User, and the Services restarting
Your administrator should be able to create the new AD User and do this for you.
I'd suggest keeping the current Local User until you have tested all is ok before it being deleted.