Resolution can be a big killer for frame rate. It would be worth looking into lower resolutions to find better frame rate.
To be honest I can't help you too much with Vista. I basically skipped using it on my home or work PC's. I can however say that on release 2GB was a sweet spot for running vista but over time this has scaled to 4GB and then onto 8GB. Of course depending on whether you have a 32bit or 64bit version will change what you can do with it.
CoH2 will want to use all of that 2GB of memory leaving your PC scraping the bottom of the barrel for system resources. I would set everything to its lowest possible form and work my way up to find a frame rate you can work with.
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#Steam AliasWL%Streak
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