You may use the following Group Policy Object (GPO) settings to lock the Screen Resolution settings in a Windows Server 2003 R2 Active Directory (AD) domain.

To configure the Screen Resolution settings open the Group Policy Management Console (GPMC) and create a Group Policy. This may be done by right clicking the Group Policy Objects organizational unit (OU) and selecting New. Additionally, you may right click the OU that contains the desktop(s) of your user(s) and selecting Create a GPO in this domain, and Link it here…. In the new New GPO dialog box name the GPO Lock Screen Resolution. Right click the newly created GPO and select Edit…from the context menu. Once the GPO opens navigate to the following setting.

User Configuration > Policies > Administrative Templates > Control Panel/Display

Enable the setting to “Disable the Display Control Panel”

Enjoy!