Three Monitors

I have recently switched my HP HDX18 over to Windows 7. I monitor a network so I use 2 Monitors. To do this I hookup a Nippon Labs SVGA Video Y-Adapter Cable to my laptops VGA port and plugin an ACER and a Sony Monitor.When I plug both in however, it allows me only to extend my desktop onto one monitor and the mirror image is depicted on the other.

When I unplug one and click detect it will come up with either Sony or Acer depending on which I plugged in. However with both plugged in it still registers as only two monitors. I am trying to extend onto both monitors, is this possible yet with W7!?

Any help appreciated.

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