Even the cheapest of new video cards support dual monitors. If I offer you tech support do my chances of going to heaven increase?
What video card did u buy? Describe how you have the monitors connected to the PC
Right click on the desktop, click properties, click the settings tab. If your computer can do 2 monitors there should be a screen 1 and a screen 2 listed. Screen 2 may be greyed out. you can activate it by clicking screen two then the checkbox "extend my desktop to this monitor". Then click apply or ok at the bottom. for additional adjustments consult the driver help section of whoever made your video card.
If you only see a screen 1 then you will not be able to use 2 monitors with your current drivers/card/setup.