This site is being deprecated.
Please see the official X‑Plane Support page for help.
X-Plane 10’s minimum & recommended system requirements are listed here on our website. In general, one thing to avoid is an “integrated” graphics card. Generally these are Intel graphics cards. Most laptops use these, but so do many low-end PCs. They are not usually powerful enough to run X-Plane 10 smoothly.
Here is a topic on the forum of X-Plane.org (a site that is not affiliated with Laminar Research or X-Plane itself) that goes into a lot of detail that might help you decide. Keep in mind it is a little old now for the outlined specs, but anything newer than the items on the list would probably be even better!
This site is no longer being actively maintained.