Hello,
You can create a custom report and target specific users and SharePoint groups. I know this functionality is available in MOSS, but I am not sure it is with WSS.
Go to your top level site, click on Site Actions > Site Settings. Under the Site Collection Administration section, click on Audit Log Reports. You will see the option to create a custom report. When you configure the custom report to run, you can specify the users the report will be restricted to. Use the Address Book icon to find the users/group you want to target.
Chris Caravajal MCTS SharePoint Help
Yes, but i don't want restrict access to the reports. I want that SharePoint usage analysis and logging don't affect specific users.
I want have analysis about how system is used by the end-users and i don't want that this reports
will be disturbed by admins accounts activity.