XP should work fine with 1GB RAM.
Your RAM capacity is unusual, so on the keyboard, press the Windows key + pause/break key and the System Properties window is displayed.
On the General tab, under Computer, Windows will show the amount of RAM it has available.
Virtual memory shortages are caused by either too many programs running, a program failing to release memory or a shortage of spare hard drive space.
It may also be caused by specifying too small a paging file if you are not allowing Windows to manage your virtual memory.
You do appear to have a lot of processes running, however it is best to check this number immediately after booting the computer.
Let us know how it goes.
Apologies if I have repeated anything already mentioned........bit late to this post and did not read all the replies.
exo