I know this is a constant topic but I really have tried and tried to add aircraft but can not seem to get them to work? Even adding new paint schemes of the existing doesnt seem to work either.

I could really use a step by step help with pics as I am not computer savvy. Once I get the hang of it I can do good but this is driving me up a wall!!!   

I have tried the many links people have sent to me but still no luck. 

I have windows xp and unzip files with IZArc if this helps...