problem on fresh install

ii see fedora 17 defult desktop screenshot




its gnome 3 :)

but after i installed i got desktop with up panel but no down panels , and i cant add any panel :blink: and also i cant right click on the desktop to add any thing



i cant even minimize any programe , or any thing :(
:doh::doh:
i have HD 4xxx ati graphic card with 8g ram , phenom amd processor with msi mainboard
:(:(

any help