on my system my total physical memory is 512 megs with 254 megs available. total virtual memory is 1.72 gig with 1.23 gig available + page file space is 1.22 gig. now the page file space is the place on my hard drive to store memory, right? does it only story memory on my page file when u run out of physical memory, right? plus, virtual memory is the combination of page file and total physical memory, right? thanks in advance.