A few NGX questions

I normally don't post but.... I have to say I think the NGX is a very good piece of software. Not only does it do all the things that other PMDG add ons have done it also really "feels" like an airliner. All thats missing is the bland food!!! I am currently getting about 30 - 35 FPS at the default Shannon (system specs at the end of the post) this drops to about 15FPS at some of the more complex airports like Aerosofts Bremen. I have two questions firstly since the NGX runs outside of FSX are there any programmes I should set my antivirus to ignore in addition to FSX? Secondly I am running FSX without using nhancer or nvidia inspector is it worth me trying either of these programmes ( I ask this as there are so many conflicting opinions on other forums its very confusing). System:- I7 930 @2.93 GHZNvidia GTX 460 1mb6 GB RAMCreative sound cardVelociraptor HDWindows 7 64 bit PS I'm not using a registered version of FSUPIC Many thanks David