[ubuntu] cant install graphics ATI mobility radeon HD 5470 / sony vaio

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http://ubuntuforums.org – hello guys i just installed "ubuntu 12.10" on my laptop and i got stuck at installing ATI driver ,i'm not an advanced user i have ati ATI mobility radeon HD 5470 i downloaded : amd-driver-installer-catalyst-13.1-linux-x86.x86_64 amd-driver-installer-catalyst-12.10-x86.x86_64 amd-driver-installer-12.6-legacy-x86.x86_64 from the amd websites i unziped them and sh ... run them and a "error message" pop up i search it on google and i ending crashing my system :( plz guys help (Hardware)