I have a Dell Slim Studio 540S desktop computer with 2 monitors connected already. Can I add a 3rd monitor by using the The USB 2.0 External Video Card from Iogear?
Absolutely, assuming you can find drivers for your operating system (not that I'm saying that it's necessarily hard or anything...).
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Vista uses WDDM 1.0 which may have problems supporting more than one display driver, so if your USB adapter uses a WDDM driver it may conflict with your main display driver.
If it uses other kinds of display driver, it should work fine. The only way to be sure is to get the adapter and test it on your computer.