Looking at the Dell website I see what seems to be a full tower case for
that system.
So the question is what type of motherboard did they use...ATX or mini
ATX.
and by opening the case and measuring the mobo you should be able to
determine the size.
A quick Google search on ATX....
http://en.wikipedia.org/wiki/ATX
will give you the dimensions and specs.......now you know what your
dealing with and what will fit in the case.
Then comes the question on operating system...you bought it with an OS
installed which will only work with that
particular mobo...its called an OEM installation and is tied to the mobo.
Then you need to look at the Power Supply and see the specs on it to match
up with the new mobo and PCI-E Video Card..most newer cards require\a
specific power connection...chances are your Dell Power unit will not have
that connection and most likely will be a little short
on amperage
So now you need to buy a Mobo and an OS and a new PSU
.....and you need to match the other components to the new mobo that will
need to be
socket 775...DDR2 slots...Sata connectors....PCI-E....
Its really is just easier to buy a newer system...unless you like
tinkering.
peter