I don't think that upgrading to Vista alone will let you play COD4 (Good game, but way too short for me!). I'd suggest using the Vista Upgrade Advisor to see if your system will even run it: http://www.microsoft.com/windows/products/...adeadvisor.mspx
I would expect that it's your video card that's limiting your playing of COD4 and that will also be a factor in an upgrade to Vista.
Vista will run with 512 mB of RAM - even back in the beta days you could get Vista Ultimate to run on 512mB (dunno about now) - but Vista Home Basic systems are currently shipping with 512 mB of RAM and they work OK for most users (NOT gamers). And, as you use it, it'll start bogging down with 512 mB of RAM - just like XP systems did with 128 mB of RAM.
There's plenty of good systems out there with specs similar to yours - it's just that you can't expect it to run the "latest and greatest" with stuff that's that old. You can either upgrade the components to make the system more current - or you can get a new system and use the older one for non-gaming stuff.
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