http://technet.microsoft.com/en-us/windows/dd262148.aspxThings to know about Windows Vista Service Pack 2 RC
Prerequisites
If you have a prior version of SP2 installed, it must be un-installed prior to installing RC
Use the Control Panel applet “Programs and Features” and select “View installed updates” from the top left of the task pane, under Windows, look for KB948465
You must have a genuine copy of Windows Server 2008 with SP1 or Windows Vista with SP1 installed on the computer prior to installing SP2
Windows Server 2008 released with the Service Pack 1 code included
SP2 is the first post-release Service Pack for Windows Server 2008
Recommendations
Windows Server 2008/Windows Vista SP2 is applicable and recommended to individuals, organizations, and technical enthusiasts who are comfortable evaluating pre-release software
This pre-release software is provided for testing purposes only
We do not recommend installing this software on primary, production or mission critical systems
We recommend that you have a backup of your data prior to installing any pre-release software
If “vLite” was used to customize your Windows Vista installation, you may have removed required system components which prevent Service Pack 2 from installing; if you wish to install SP2, a reinstall of SP1 without vLite is recommended
Service Pack Information
SP2 RC is pre-release code which will change before the final release of SP2
Windows Server 2008 SP2/Windows Vista SP2 RC is time-limited software that will operate until June 1st, 2010 - Un-install Windows Server 2008 SP2/Windows Vista SP2 RC before June 1st, 2010
After SP2 installation your desktop may display the text “Evaluation Copy”. This does not mean that your system is no longer “Genuine”, only that you have installed a test version of software which is time-limited
After installing the service pack, the “Evaluation Copy” text may show up on the 2nd boot
After un-installing the services pack, the "Evaluation Copy" text may remain during the first boot, but will disappear after the next reboot
Starting any Windows Server 2008 SP2 or Windows Vista SP2 installations will result in Microsoft collecting information about the installation process