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In general I would never recommend to upgrade a fixed (mass production or brand built) PC. Also with these specs if your are trying to make a gaming PC out of it you are going to be disappointed. Never the less if you still want this I can only suggest to go for the bigger PSU like GS800 so the GPU could work a bit better plus a set of ram for a total of 8.
Yes pentium 4 supports 4gb of ram.. older system supports 2gb of ram.. So you can increase your memory to your suitable choice. While for agp graphics cards xfx radeon hd launched 4650 agp graphics card with gddr2 memory so you can purchase it for graphics card needing 1gb memory.. Please rate me on fixya if i am helpful..
If you are using Dual Core the mother board you are using may have PCI Express Slot. So that you may install Graphics card. Only for particular lower end mother board doesn't have this feature. Any way tell me your motherboard make and model no. e.g., Intel DG31PR, 945GNT, DG41TY etc.,