I got an "Strange" PC and i have lots of problems with it every day

-Biostar P4M800-M7A motherboard with an INTEL P4 3.2 Ghz procesor
-ATI Radeon 9250(AGP) videocard that overheats like...
-1024 MB Ram
Im an World of Warcraft and Aliens vs Predator fan but in the last months iv played only Age of Empires 2 because of my videocard...