A big red flag pops up when PC specs include words like "Mobility" or "ATI" or "Radeon" or "Video Memory Up To...", and exclude graphic card specs. Meaning CPU and RAM cycles are scavenged for video. Bad news! Without a dedicated graphics card, a PC will likely never get over 20 or 25 FPS, no matter how much RAM or HZ. These systems work for MS-Office, browsing, and email, but suck when watching a DVD or BluRay, or for high intensity graphic applications and games.
PCs are available $500 to $1000 with dedicated graphic cards, both desktops and notebooks, that are much more capable. Shop around, educate yourself, don't buy the typical PC displayed and hyped at your local big box store; they are really junk with the cheapest processors, no graphic card, and "home" versions of Windows. "Ex used car salesmen, now PC salesmen" push the junk for a reason; low cost, high profit and commisions; it's their gain when you (or your parents) are down $1000+ and stuck with a PC that doesn't perform.