mine was a problem of images not being sharp on some items,web pages and office ok but most other items blurred a bit as if wearing someones glasses.
i changed monitor settings from dynamic to standard.In w7 changed default dot from 125% default to 100%, and change screen res from default 125% to 100%. i think i will have to wait for samsung w7 driver to get perfect again. [in vista everything was razor sharp]
Hmmm what i'd try next is start windows in safe mode (tap f8 shortly after the computer is turned on) and that *should* load default "get you going" drivers, but it also loads default settings, if its bright then, you know its a driver/software problem, then google it and see if other people are experiencing this.