I know this question is not releated to programming but I didn't know where to post it.

So,I played around with the windows font & color calibration settings,and now I just want to restore all colors and fonts back as they were,anyone know how to do that?

Think there's a button for resetting font settings.

On color calibration, here's an answer from MS on disabling loading of your screen calibration:

http://answers.microsoft.com/en-us/windows/forum/windows_7-desktop/restore-default-display-color/7553a387-0965-4639-94c0-b21af6ab1e8c