Hi All!First, this is my first post.I have been using Avisim community ages ago, and after long time I have been able to join a FlightSim community again.Apart of the congratulations regardless the NGX (I'm a flight attendant and I have been working on a 737NG), I can say that the feeling with noises and panel details are just "real". PMDG 737NGX will be the best fs add-on for FS for long-time.I'm setting up, a best as I can, but I'm having two issues that I can't manage with.First regards Performance manager. I can't switch from High Texture to Low Texture. The green signs keeps staying on the high texture tab and I can't switch it.Second is about livery manager. It gives out a "installation" trouble saying that Windows can't go forward with installation and it stops.My PC has been just cleaned up, there is no any other add-on included on it.I have FSX + SP1 + SP2 and Windows 7 installend on it.FSX in INSTALLED on a external hard-disk mentioned as "H".May it be the mistakes which doesn't let me makes any modification on livery manager and performance menù?Is there any chance to set it up in another way?Kind regardsT737NG

Not sure I like external hard drives as an FSX device personally, but I guess it depends on what type it is. Judging from the hints you gave in cleaning up an existing system, I'm doubting your external drive is scs or higher. If it's USB or firewire then I wouldn't do it but this is all because performance. Maybe external SATA 2, but for me that would be a minimum.Moving on to your issues. Try running the Performance manager as administrator (right click it and choose "Run as admin"). That will most likely clear that up but not if your drive is being seen as "Offline". I would imagine if that were the case that it would say so. If the 1st thing doesn't work, try doing something right before you run it on your H: drive, to wake it up and seen in Windows. Sometimes non C: drives or non-internals can cause a hiccup in windows.As for the second issue, fo as above and run it as admin also. If you have issues then, it might be with your permissions. Win 7 ultimate has group policies that can be edited, but Win 7 regular version such as home edition may not give you admin rights even though it says so. UAC (User account Control) could also be screwing things up. In any case though, running as administrator should point these other possible issues out, being if you run it as admin and still get the same error, then it's most likely Windows.Hope this helps.