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So, can I replace my vid card with one that does 3+ displays & is compatible with Vista?
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There are very few vid cards that can drive 3 diplays on the market. Those that do exist will not be cheap imo.
What you
can do, is purchase a PCI card (Not PCIe), which will fit in one of the empty white slots on your motherboard.
http://www.newegg.com/Product/Produc...82E16814140085
is the cheapest suitable card (a PCI GeForceFX 5500) I could find with a DVI port, only a quick newegg search so there may be cheaper models.