First thing you can do is go install the latest NVidia reference drivers. This will give you access to the NVidia System Monitor, which will show you GPU temperatures for most video cards. Yours should run under 85C while playing or you are potentially going to see heat-related issues. Note that system/case fans that are clogged with dust will indirectly cause your GPU to heat up, too.
Second thing to do is double-check your event logs and make sure you aren't seeing driver crashes or other Bad Things(tm). For more information on using that: http://www.youtube.com/watch?v=Um_zLfXqXyc
As for dust being a problem, not unless it's caked on.
GT440 will struggle as it's just not a high-performance card. No idea how it will fare in MoP or how many clients you ought to be able to multibox.
As for upgrades, your CPU and RAM are fine. The biggest upgrade would be a modern graphics card like a GT560/570 or one of the better ATI cards. Give us a budget and we can make better recommendations, though you might end up having to upgrade your power supply to support it (figure another $150 for a good PSU from Thermaltake or SeaSonic). And if you need a new PSU, make DAMN sure you contact HP and make sure it will properly support your motherboard's connectors. HP sometimes uses specially-keyed connectors that aren't the same ones you see in stores.
Aero will probably hammer your poor card as it is not a performance/gaming card. http://www.tomshardware.com/charts/2...lass,2882.html will show you how poorly it fares even in the "Entry-level" class of video cards.
Lax can better answer your question about performance in stacked vs "corner" layouts, etc.
Good luck!
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