Windows – Why can’t Logman start

I'm setting up my first logman counter. But it's not working! There is some file or folder permissions problem. Or maybe I wrote the create-counter statement wrong.

Here's my counter commands:

logman create counter BillTest -si 30 -v nnnnnn -max 200 -o "C:\Temp" -c "\Processor(*)\*" "\Memory(*)\*" "\LogicalDisk(*)\*"
logman start BillTest

The first command works. It says counter creation successful.

The second command fails:

Collection "BillTest" did not start,
check the application event log for
any errors

Here's the error in the Event Viewer:

The service was unable to open the log
file C:\Temp_000001.blg for log
BillTest and will be stopped. Check
the log folder for existence,
spelling, permissions, and ensure that
no other logs or applications are
writing to this log file. You can
reenter the log file name using the
configuration program. This log will
not be started. The error returned is:
Access is denied.

I verified that C:\Temp exists. I'm not a permissions guru, but I did set all the accounts in the security tab of that folder to "full control." Still, the logman start command failed with the same error.

I noticed that it was trying to write to C:\Temp_000001.blg instead of C:\Temp\000001.blg. That might be part of the problem. So, I tried to update my counter to "C:\Temp\" instead of "C:\Temp", but that failed with a path-invalid error. Also, all the examples I saw online used did not put a trailing slash. So, no dice there.

I tried this on my machine (Windows XP) and my dev server (Windows Server 2003). Both failed with the same error.

How can I fix this?