Companies like Dell use Integrated everything because it's cheaper considerably cheaper to make something and flog it off the Joe Public. Of course Joe Public wants the cheapest that they can buy so everyone is happy till something goes wrong.
As I do not have your Service Tag I do not know the exact configuration of your system but it supposedly comes with a P4 CPU up to 3.06 GIG. Now these are the old generation 478 Socket CPU's so you will have to get the fastest that you can find probably second Hand or at least Old New Stock to change this.
The Video Card that this system supposedly takes is AGP so you'll be looking at Old Technology again as AGP is now no more as it has been replaced by PCI Express so you will have to look at a AGP Video Card with at least 256 MEG Memory Capacity and ideally more like 512 or better. This will still be slower than a PCI Express Card but it will work. But the good news is that this is an Intel Chip Set M'Board so you should be right with any 16 X AGP card. Either NVidia or ATI should work with this M'Board so you have a wide choice of available Video Cards.
If you really insist on Down Grading to Vista this M'Board can hold 4 GIG of RAM and you'll need to fit this much RAM to have a fighting chance of Vista running acceptably on this system after you fit a Video Card and possibly up the CPU as well.
As this M'Board only supports IDE Drives again these are the Old Technology and the slower types as well as some companies are stopping making them so you will have limited choices very soon if not now. But you'll need to go with something bigger than what the unit came with to have enough room to run Vista reliably and fast enough to be useful. But here is the problem IDE Drives are controlled through the BIOS and BIOS has a Upper Limit on the HDD's capacity/size that it can support so you'll need to go bigger but not so big that the BIOS will no longer recognize the HDD's. Though it is possible to fit 2 HDD's to this computer according to the Specifications provided by Dell. So you could run a 2 HDD configuration to have sufficient size for your needs if the BIOS can not support the HDD size that you require.
You'll also need a DVD Reader at the very least as Vista comes on DVD not CD so without a DVD reader you will be unable to load Vista before you even start. This thankfully is a straight swap and only requires money to buy a replacement DVD Drive and undo 4 screws to change the Drive. It should just be a matter of Unplug the Old Unscrew it slide it out slide in the new one Plug it in and screw it in place.
The next thing is that Dell state that the PS here is 250W which if it was an Antec or similar Power Supply may just be big enough but with what Dell supply it is underpowered to hell and needs replacing. But here is a problem as Dell do not always use a Standard PS you may find that you are unable to fit a Standard Bigger Wattage PS into the case.
With all PS you are better off buying the better kind those are rated to continuous power output as apposed to the cheap no name ones which are rated to a peek value which they can maintain for a few minutes and then need to be run well under this limit till the PS cools sufficiently to be able to provide the higher loads again. This can range from 2 minutes at full power and then 25 minutes at a much lower power to keep the PS safe and not burn out. But remember that those are rubbery figures as I don't know which PS you actually have.
As for external Equipment you need to check it all to make sure that it is Vista Compatible. So anything that you plug into the computer Will need testing. This includes Printers, Scanners, External HDD enclosures, Camera's, Thumb Drives and in fact any USB Device that you have.
There are several USB HDD Enclosures that do not have Vista Compatible Chip Sets in their Interface Cards so they will not work with Vista and the HDD that they attach to will be unreadable
That is a short overview of what you are looking at and is by no means a complete guide to what is required.
Also you need to understand that Vista Compatible doesn't mean that it will run Vista Well just that Vista will run on this hardware in some shape or form. It may take 20 minutes to boot but it is still running Vista. It may also take 2 minutes from when you click on a Mouse Button or push a Key on the Keyboard to get a response on the monitor. That is what Vista Compatible means.
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