Marson:  If your not running at least 512 MB of memory your best immediate bet would be to upgrade to that amount.  Adjusting the bios setting will shift your existing memory towards the graphics content but at the cost of the main system memory (this is of course assuming that you are not already using a dedicated graphics card which would be another good way of boosting power).  As far as directly assigning memory towards that application, i could easily be wrong on this but i dont think Windows allows its end user rights to assign direct memory access.