This must be warning of th e trial license on Power Center. Power Center is installed with trial license for 60 days. You need to install the license for continueing to use the Power Center. Go to the web site down load the license and import the license.
1- Go to www.dell.com/powercenter
2- Click on "click here to down load"
3- Down load the "OpenManage_Power_Center_License_1_2.zip"
4- Unzip the license zip file and get the xml license file
5- Select "SETTING"->Licnesing from OMPC menu then import the XML license file
Note: The license file from "click here to down load" is for Power Center 1.2 release. If you have older release then need to go to the "previous version" from "click here to down load" to down load the license file for your appropriate version and follow the same steps for importing the license file.
Hope this helps.