Lets cure this compter from the fever..
first try this..
Its in display settings. Alt+F2 type display and it should be there. Like I've said it should let you choose your monitor's make and model it will then give you the screen resolution options for that particular model.
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check drivers especially vga one's and Service packs
try checking any third party or overclocking app
try open cmd prmpt nd typ
powercfg -h on
download latest crivers and install them after uninstalling the drivers completely.