Mine will manage 32-bit colour, but only at 1024 x 768 pixels. If I try to increase the resolution the number of colours drops to 16-bit. I have 32 Mbytes of onboard shared graphics memory. It doesn't matter, 16-bit colour is fine, it won't affect the numbers of colours used in your prints. I find the higher resolution too fuzzy any way, so I don't use it.
If you really meant to say 16 colours, then you do have problem.
State your graphics card, or onboard graphics chip, Operating System, and other relevant details. Then maybe someone can help. I am not too sure what you need to do.
Control Panel, System, Device Manager, Display Adapter will show you what you have. You say you have no drivers. Why not? Did you have them before, install a new card, reformat your drive. Is anything shown in Device Manager? At least a generic driver.