Graphic problem - help please

[e><pert]

Hi everyone, I installed iAtkos v2 s3 on my PC and everything works great but after a while I noticed that iPhoto (Preview) does not work does not display pictures, also when I run Front Row is just a black screen, is also an option for "Translucent Menu Bar" is disappeared, I could not find a solution so I re-installed the system, everything worked great until I installed an application that requires restart, after a new start, I have the same problem again, I have a nVidia 8600 GT 512 MB.
Help please

[Unrealized]

What's your graphics card?

You need to use a kext for it, or check GraphicsEnabler in Chameleon.