getting that message means you are loading too many things in your pc na hindi na kaya ng windows. to solve that problem allocate more in the virtual memory setting (dont let windows manage it for you)
if you really want to change hardware then add more RAM, especially since you mentioned onboard ang video card mo. so if your RAM is 512MB, less pa yan for the video (i.e. 64MB) so your free RAM is only 448MB.
im guessing those two programs are not the only ones running in the background thats why u get a warning. try to remove those other things in the taskbar that you dont use currently (i.e. YM,chikka,office quickstart, etc etc)