I'm trying to change a car in NFSU2 but I need to open an application called NFS CFG Installer but I can't. I followed the video that I will also post below but when my Anti-Virus is on(AVG) the program is there but I can't open it because it says I don't have permission even if I ran it as an administrator. But when I turn the Anti-Virus off(Which is what I'm suppose to do)the NFS CFG Installer disappears. I can do either one and it would still end up the same. If you want me to upload a video of me doing it just let me know.

The video: