Well you could start by reading this thread click here
However I would suggest that you read this thread first which is on the on the Adobe forums click here.
This is a common fault with these monitors or I should say the calibration software that comes with the monitor.
Your problem is almost certainly down to the incorrect calibration of your monitor. If you are prepared to spend a little money £50 or more then look here click here
If you are not prepared to spend any money to recalibrate your monitor, then use use this freeware, click here it's very good, I used it for several years before buying the Colourvision Spyder 3Pro.
Also have a read here click here