WMI Error (not Install/uninstall -- Performance Monitor Derived Class)

Trying to use WMI to monitor a SQLExpress DB and not getting anywhere. In fact, wmiprvse.exe croaks.

Here's the query I'm running from within CIM Studio:
select * from Win32_PerfRawData_MSSQLSQLEXPRESS_MSSQLSQLEXPRESSDatabases

(Just did a search for SQL and found this class)

When trying to get an instance, WMIPRVSE throws this exception:
The exception unknown software exception (0xc000000d) occurred int he application at location 0x7814454d.

Ok to that, then another msgBox shows up with a title of

"Multiview Message" and text as below:
Win32: The remote procedure call failed.
An error occurred while attempting to retrieve the list of objects.

Any suggestions on this would be appreciated. Or perhaps another WMI class to use?

(XP Pro SP2, current with the patches; SQLExpress and MSDE both running)

thanks