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Sounds like it's either a display driver issue, you're booting into safe mode or you don't have administrator privileges to make permanent changes to your screens resolutio
Backup important data and format the hard drive then reinstall Windows clean.
It sounds like windows is reverting to native video drivers, and resolution. It happens occasionally from some updates, or other major changes to system files. I would reinstall the up to date drivers specific to your video card. If it keeps happening the issue is deeper than this. It would require cleaning of registry entries related to video drivers.