Hi, Welcome to the community I recommend you get a wireless USB dongle. It will be plug and play process, this will be the most convenient and practical way to make your Desktop connect wirelessly. Here is an example ;  search.dell.com/results.aspx Let me know if further help is needed.
Recently finished getting a Dell XPS 410 core 2 duo back up and running, and need a wireless internet card.  Do not need anything fancy, but is there something specific I need to look for, or avoid?  Thanks
Need wireless card for Dell XPS 410