So I ran into this issue the other day..

Scenario: My client has a Server 2003 PC and the C:\ was running low in diskspace started looking around to see what big files were on the system.. to my dismay I found c:\windows\system32\wbem\logs\Framework.log to be 600MB and growing slowly.. After some research on Google to check my theory that this file was way too big.. I found that this is a common issue in Server 2003 and has to do with a permissions issue on c:\windows\system32\wbem\logs folder.

Fix:
Set the permissions on the %systemroot%\system32\wbem\logs folder (example c:\windows\system32\wbem\logs ) so that the Network Service account has the Delete permission.

Locate the %systemroot%\system32\wbem\logs folder, right-click on the folder, and then select Properties.
On the Security tab, click the Advanced button.
Select the NETWORK SERVICE account from the Permission entries list, and then click Edit.
Locate the Delete permission, and then click to select the Allow checkbox.
Click OK three times.

delete the Framework.log file and you should be set