system freezes after turning on desktop effects

hi, i am using DELL XPS STUDIO 1650 with configuration

Processor
Intel® Core™2 Duo Processor P8700 (2.53GHz/ 1066 FSB/ 3MB Cache)

Memory
3GB (2 X 2GB) Dual Channel 1066MHz DDR3 SDRAM

Hard Drive
320GB 7200RPM SATA Hard Drive

Video Card
512MB ATI Mobility Radeon HD 3670

Wireless Network Card
Intel® WiFi Link 5100 (802.11a/g/n) Half Mini-card


i have installed the new 11.2 OS, every thing went well until i switched on the desktop effect, when i clicked the apply button the whole system freezed, i had to manually switch of the system and re-started. everything went well until the username and password was entered, at the time of the progress bar the system dint respond, but the curser was moving but very slow moment was observed. i tried to repair the system with the repair system option, i tried repairing the file system i got the following error after pressing the help button

"error detected

the Ext4 file system of the partion /dev/sda6 is corrupted. to repair the file system, press repair"

and the second sda7 with the error “the Ext4 file system of the partion /dev/sda6 is corrupted. to repair the file system, press repair”

i pressed the repair button but nothing happen. and i even tried to re install the OS, the same problem exists. please help me with this. thank you

Did you install the graphics driver?
ATI - openSUSE

openSUSE Graphic Card Practical Theory Guide for Users - openSUSE Forums