Hey everyone,
Actually I want to post this to tonymacx86 but They didn't approve my account so I have to figure it out that issue immediately.
P.S. : Sorry I can't speak Greek so I'm writing in English.
I found the Mavericks Installation video on Youtube and done all steps. I'm writing this post on Mac. Mac OS X recognized my Ethernet and audio drivers but Wifi card and kind of graphics card not working properly. Wifi doesn't seen in Network section but ethernet working very well. Graphic card shows on About this Mac but It say sometimes 8 MB sometimes 16 MB It's not correct !
My laptop info at the page below. Please help !

HP HP 650 Base Model Intel i3 processor Intel HD 3000 Graphics Card Ralink Wifi Card 128 GB SSD harddrive
On this hardware sometimes graphics getting slow and looks awful..

Thanks...