And once again, memory (RAM) is NOT the same as harddrive. You can't have 500 GB memory on a regular computer
(unless you've got a computer cluster, of course). Most people have regular laptops or stationary PCs, and 512mb to 8gb memory/RAM is what is normal for most personal computers.
If you tell us which OS you're using (operative system - like Windows Vista/XP/7, or Mac) we can help you with where to find the comptuer specs, if you don't already know.