Atomic Rooster
Omnipotent One
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Well, you can't remove the "dedicated" video card as it's a chip that is integrated into the motherboard.
This will help you with the memory: http://support.dell.com/support/edocs/systems/dim4500/replace.htm#1101964
This will help you with the memory: http://support.dell.com/support/edocs/systems/dim4500/replace.htm#1101964