Ravi, what's your OS? It likely it is the UAC (User Account Control for the non-TLA version) kicking in. Turning off UAC, or lowering its level, is not recommended. So the best I could dig up was this
how-to.
In any case, I have never managed to get on top of Windows security tokens, etc. The problem statement is the Now2Ami requires higher privileges to be able to access NOW internals. Maybe, somebody more conversant with setting Object / Group / User Security permissions from the .exe (or shortcut) properties may be able to help you better.