If you have a GeForce2 GTS then it is a full GeForce2 card in an AGP slot, therefore you should have not problem removing it and replacing it if you want to. You can check to make sure by popping open your case and taking a look. It should be the card at the top with the fan on it
Yes, you can use the Detonator drivers directly from nVidia. If you have any video in(not sure if the Dell boards do or not) then that may not work with the reference Detonator3 drivers, but if not then your board should work the same as it is now if not better(depending on the driver they shipped the computer with).
To find your driver version, right click on "My Computer" and click on "Properties". Then click on the "Device Manager" tab and check the "View Devices by Type" box. Find "Display Adapters" and click the plus sign. Dounble click on the GeForce2, this should bring up the GF2 screen and you can click on the "Drivers" tab on the top. On that page, click on the "Driver file details" and it will list a version number something like this-
4.12.01.0647
That would be a 6.47 driver build. I would reccomend the 6.31 drivers for someone that isn't a "geek", the later drivers are beta and can be problematic. First thing is to check the drivers that you are currently running, no use trying to update if you are running the Det3s anyway.
Feel free to ask anymore questions you may have
