Clearview will run fine on a 2.2Ghz Celeron. So will FMS. I'd also bet that EasyFly 3 SE package I mentioned would run perfectly well also. What they won't run well on is the integrated Intel video that your cheap PC probably uses. An inexpensive 3D video card with its own dedicated memory will make any of those simulators run well on 2Gb of Ram and a single core 2.2Ghz Celeron CPU.