I assume this is a laptop.
Here's what to do.
Try opening your programs by right clicking the exe file and "Run with graphics processor > High-performance NVIDIA processor". If such an option doesn't exist in your right click menu, you can add it in Nvidia control panel at: Desktop > Add "Run with graphics processor" to Context Menu.
If that doesn't work, there may be a manual switch on the front of the laptop that turns the GPU on/off (Nvidia gpu that is).
Pics for both below.
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