I am trying to configure the NGX useing the .ini files in the FSX\PMDG\PMDG 737 NGX\Aircraft folder, but when I go to save it it says , This file already exists would you like to overwrite it?, so I say yes and it says access denied...please help! :sad:Thanks.

What are you trying to do, exactly? You can configure all of those options through the PMDG Setup->Aircraft menu in the CDU. Anyway, that sounds like a file permission problem. Did you install the NGX as an administrator? Where is FSX installed? Also, you need to sign your full name to your posts, otherwise they might be deleted.

I assume you have fsx installed in the default location, windows sets a lot of files there to read-only. You can try changing that in the file properties or running notepad as asmin.Also, it is better & easier to do it through the cdu in the ngx.