I tried accessing User Profiles and properties in Central admin, and got error:
"The evaluation version of Microsoft Office SharePoint Server 2007 for this server has expired."
Additionally when I tried using search from my site, it would give me some unexpected service.
The cause to these errors is insufficient permissions to WSS_WPG and WSS_ADMIN_WPG group users to registry.
Finally I was able to resolve these errors, here are my findings:
First of all open the registry editor (Regedt32.exe). you can open it through C:\Windows\System32. From there on the registry key HKEY_LOCAL_MACHINE\SOFTWARE\MICROSOFT\Office Server\12.0 give read permissions to WSS_WPG group and full permissions to WSS_ADMIN_WPG.
Once done with this, add the identity of application pools in the Distributed COM Users grouup.
Do a reboot of the server, and you are done.
For reference go through the following post: