I would tend to agree with both Nytefall and 'wiffo, but would like to add a couple of comments and clarifications.
You have a relatively old Dell business computer. The integrated Intel video chipset is only barely passable for playing RoM. In addition to this, and while your computer does have a PCIe X16 video expansion slot, it's stuck at PCIe 1.0. Most modern PCIe video cards are at version standard 2.0 these days, but some of the less-powerful (and power-hungry) cards are backwards compatible with version standard 1.0. So you may be able to find a dedicated video card for your computer. If you do go looking for one, consider talking to a professional installer first.
The amount of system RAM that's currently installed in your computer should be sufficient to run our game, but I'd tend to recommend not running other applications, even minimized, in the background. Your computer uses PC4200 533Mhz SDRAM modules, and will address up to a total of 4GB, using 4 connectors on the system board. I do not know the configuration that's currently in your machine, so if you decide to expand your system RAM to 4GB, it would be best to search for and purchase a pair of 2GB (2 x 1GB SDRAM modules) memory kits. The best places to look for and buy those are online, at sellers such as NewEgg.
Hope this helps.