In general the card is slightly too old to be fully supported by vorpX, so there might not be a solution to this issue other than upgrading your PC.
There are two things you can try though:
1. If you haven’t done so already, you should update to the latest GeForce drivers.
2. Considering the age of your card, it might just not have enough memory to work with vorpX in these games (stereo rendering has higher memory requirements), so if possible you could also try to lower the detail settings in-game, most importantly the texture resolution.