Installation permissions

[N Cohen]

I have installed debian v.r2.2 OK on my 8600 on a number of occasions 
when XF86Config worked OK but now after I install when I attempt to 
use XF86Config I get permission denied. If I add chmod  g+rx or 0755 
then the file will not execute but simply shows as a text file. I 
dont know what has happened but need some help please as I cannot 
configure my mouse. Thanks