Sceen distorted!! Can someone plz help!!

It suddenly happened yesterday, when all my settings were wiped out and i had to redo my settings again (setting video cards, resolution and such) After i reseted everything and got back on, the screen was distorted (i am not running in window mode), everything in game seem to be flattened somwhat, i'd say by 10% or so. all the characters, buildings, and machines all seem to fatter and shorter (actually look kinda like it was running in window mode), one can clearly tell all the images are distorted!! i tried to change all the settings including picking all video cards and resolutions, nottin seem to be working at all!!! So if someone know how o resolve this, plz let me know!! cuz this is getting very annoying!! thanx alot.