How i can get rid of my graphics probelm?

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http://askubuntu.com – I have 64 bit Ubuntu 12.04 LTS and I have installed proprietary drivers for my Radeon HD 7670M/2GB but if I scroll page or do anything like move a window then i get blurred screen(more like scrambled maybe) for a second and if i try to take Prtsc of it is goes to normal. I have tried other drivers it does not solve my problem. And I do not want to go over 32 bit Ubuntu because I have 6 GB ram and i would lose so much of it. Also if it helps my processor is Intel® Core™ i5-3210M CPU @ 2.50GHz × 4. Thanks in advance for your help. (HowTos)