If your monitor cable plugs into a port that is flush with the USB and mouse ports on the back of the PC, you are using the motherboard's integrated graphics.
Even though your CPU is old, the graphics hardware is likely Intel. intel r pentium r dual cpu e2160 graphic driver free zip
Typical compatible chipsets that provide integrated graphics for this CPU include: Intel G31/G33/G35 Express Intel Q963/Q965 Express How to Download Drivers for Your System If your monitor cable plugs into a port
If your motherboard uses the , here is the correct driver: intel r pentium r dual cpu e2160 graphic driver free zip
If your motherboard uses Intel integrated graphics, the most common drivers for these legacy systems are: