Most will have to buy a new computer to work with the current VR offerings. Your normal Dell isn't going to drive it. Expect to spend $3k or more to meet those requirements. Some even package in the computer because they're pretty specific on what's needed.
You have no idea what you are talking about. There bundles available that include a beefy Windows machine plus the Rift that has been pre-approved to meet all the requirement and they start at about $1500 US.