so...
your computer don't recognize your nvidia graphic card in PCI Express slot.
you are runing now with computer's integrated graphic card?
if so then you won't have dualview option. in this case it looks for me like you've installed in the wrong way your graphic card.
your NV GeForce 7300 GS has 2 video output?
if yes then you should have the option for 2 monitors on nVIDIA control panel (i have check my nVIDIA GeForce 7600gt and in my case this option is present but is enabled only if i connect the second monitor, so try do so)
you have installed the latest nVIDIA drivers from the official website?
http://www.nvidia.com/Download/index.aspx?lang=en-us
check if your video card is corect installed start/run type in " devmgmt.msc ". it will open device manager and under the display adapter tab you should see what video card you use now.
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