FAQ in Windows OS
Windows security
Unable to save permission changes on hosts
Access is denied
answer: close anti-virus software
OpenGL 2.0 or greater required.
- Right-click the desktop, and choose "Screen resolution" from the popup menu.
- Click "Advanced settings" under Resolution.
- Click the "Properties" button on the Adapter tab:
- Click the "Update Driver..." button on the Driver tab:
from:https://iscreensaver.com/help/notes/update_opengl_drivers/update_opengl_drivers.shtml#easyW7
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