AOC likely dropped Win7 support. Use Snappy Driver Installer (SDI) Legacy or extract drivers from the original recovery DVD (if you have one).
Solution:
The AOC CA201MA seems to be a specific model, but detailed information about this exact model is limited. AOC's product lineup includes a wide range of monitors, from basic office displays to high-end gaming monitors. If the CA201MA is indeed a product from AOC, it might be an older or less commonly distributed model.
On the AOC CA201MA:
Once your driver rede is working: