tommy737ng

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