Sounds to me like a corrupt user profile. To check, create a new profile, log off your current profile, log on with the new profile. Then, set your resolution, log off, and then log on using the new profile.
If the resolution is maintained, your original profile is damaged.
I am not very "techy" and not sure what you mean or where to go on my computer to do this. Can you humor me with a bit more information?? (-:
On W7, Start, control panel, user accounts and family safety, add or remove user accounts, create new account.
Then create the new account (which I called profile).
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