Perfmon - Zeros on SQL Counters

Hi all,
I have recently set up performance monitoring for all the SQL Server instances in our environment. One of the servers, however, is reporting all zeros for SQL Server related counters. What I have done so far:

• Opened perfmon on my local machine - returns all zeros
• Checked sys.dm_os_performance_counters - plenty of values there
• Opened perfmon on the remote server - also plenty of values
• Opened perfmon on the remote server with the /wmi switch - returns all zeros (hmmm... sounds like a WMI issue)
• Checked all permissions on OS groups and WMI namespaces - looks good
• Connected to SysmonLog WMI class on "working" server - returns two instances, one is specifically for SQL Server
• Connected to SysmonLog WMI class on "not working" server - returns no instances

This tells that SQL Server somehow did not register an instance under the SysmonLog WMI class. So how do I do that without having to reinstall SQL Server (I'd really rather not have to reinstall)? Or am I barking up the wrong tree? Google has gotten me to this point, but now I'm stuck. Any help would be appriciated.
Thanks in advance.

Windows 2003 Enterprise x64 R2 w/ SP2
SQL Server 2005 Enterprise x64 w/ SP2 + CU1