There are a number of posts regarding a hotfix available for Windows 2000 to fix an issue where Performance Monitor displays only numbers for performance objects and counters. However, I came across this problem the other day on a Windows 2003 server. After searching for a while, I found a solution that worked: http://support.microsoft.com/?kbid=300956. Simply running the following command from the command prompt, restored the text values to the Performace Objects:

lodctr /R