Firstly DON'T USE UPPER CASE IN YOUR THREADS ........ IT MAKES IT DIFFICULT TO READ AND TO SOME PEOPLE IT LOOKS LIKE YOUR SHOUTING.
OK now onto your problem Your Dell is, with all due respect, a budget desktop system. Yes it has a Intel Core Duo processor but it's still classed as a budget system.
Your graphics card is a NVIDIA GeForce 8300GS with 128 Mb of it's own RAM ( so it's not sharing any with the PC itself ) but as Dell say it's the strength of the actual signal that's the problem.
Just because you have two graphic ports does not simply imply you can connect a monitor to each. It's a bit like a house wiring system. In your typical three bedroom semi the downstairs wall plugs are probably supplied by a 30 amp ring main, those upstairs by another separate 30 amp ring main. You could have 12 or more wall sockets downstairs but you could not plug in and switch on 3 x 10 amp heaters plus your TV into the sockets without blowing the fuse box or circuit breaker ... the same goes for the output power of the graphic stream.