saran008 :
Check adjusting your Screen resolution again System properties.
have you made any changes, before the resolution size change took place?? any hardware/software changes??
Check for the device manager for yellow exclamation marks? (Failure of drivers).
Download & install the latest display drivers for your video chip-set & try again.
There is no change on my software and hardware at that time.
I also made no change at my resolution until now, it still at 1280x800 .
There is no exclamation marks on it (working properly).
When i update it, it says that the driver already updated to the latest version .
another problem is the icons looks so blur, in the desktop, or even in the start menu .
its like opening in safe mode .