Computer Freezing

[KaY_ThE_GrEaT]

I'm having troubles with my computer with logging on to Maloria for about 10 mins or so... Then my computer freezes up for no reason, and I have to reset it or sometimes it just reboots it self.. This is really weird o_o; it only happends to me when im only on Maloria. I already deleted all my graal stuff and downloaded it again and I don't know what to do.. My Driver is a
"ALL -IN- WONDER RADEON 8500DV" if that helps at all =o Please help me fix this problem..