Performance counters on SYSIMG1 became corrupted recently. The MS KB is full of strange and dated advice on the subject. Here is the most recent article I could find:
It is full of tedious and laborious steps to manually repair the performance counter object mappings. Towards the bottom of the article, we learn that on Server 2003, the following console command will restore corrupted counters, thus obviating the need for any manual config steps:
This will re-read all of the perfXXX.ini files in the system32 directory and rebuild the counter data. If you have any apps running that do not house their .ini files in “system32” you will need to load those manually.
In any event, the above command fixed the problem on SYSIMG1 quite nicely. Thanks, MS!