I've been trying to install repaints for pmdg 737 - 800/900. But they give me an error stating that " Cannot open PMDG 737 - 800 Aircaft.CFG file " Any Help ?

You're not that likely to get much help around here not signing your name at the end of your post...And: Using capaitals only in your post title is the forum equivalent of shouting...So, please sing your name at the end of your post... or you could try e-mailing support at precisionmanuals dot com...Andrew