i think i found the damn solution!!!
it was acceleration issue!!
when i entered display properties from the desktop (right click)
i went to "advanced"-->troubleshooting--> & i decreased the indicator from "Full" (dragging the inidicator one step left)
hope this thing wont come back!
Sadly AMD has stopped driver development for all legacy devices (all cards below HD2k) and my DVI issue won't get fixed either. If I would have access to the source code maybe I could fix it but I really doubt that I could get it