Actually with 512Mb of ram you don't necessary need a pagefile at all. Situations where you will fill that amount should be rare, and it should never happen with playing AH.
If your system repeatedly cries out for more pagefile, check out your settings.. Which HD you have set the pagefile to? Does the SYSTEM have read/write priviledges on that hardrive if you use ntfs?
Pagefile report at bootup is a sign of either not having an active pagefile at all (system can't read/write to the hd it tries to access) or your computer is infected by something that's eating up all your available ram immediately as you boot the computer.
In either case it's necessary to get the computer checked by someone who know's how to troubleshoot.
The 1.5x ram advice above is an urban legend carried out from the times when computers used to have 16mb of ram and the pagefile was a crucial extension to the ram.
NT, w2k and xp only reckommend 1:1 ram/pagefile because they want to make a full memorydump in case of a BSOD. Memorydumps are not usefull nor necessary so you can safely set your pagefile as small as necessary.
I use typically at max 85% of my RAM even when I'm doing videoediting (albeit vcache is being used at that time), and I have as much ram as you do. So in my system I can disable pagefile totally if I wish to do so, without any side-effects to my normal usage. At extremely memory consuming tasks such as editing above, you might need a pagefile, but not likely with any decently coded game (notice how I left out WW2OL..
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