in the scope of Windows (OS level), you may configure Windows to audit OS level activities including logon events, account management, policy change, privilege use, system events and more.
Which Versions of Windows Support Advanced Audit Policy Configuration?
http://technet.microsoft.com/en-us/library/dd692792%28WS.10%29.aspxAdvanced Security Audit Policy Settings
http://technet.microsoft.com/en-us/library/dd772712%28WS.10%29.aspxhowever, please be aware that the above mentioned is for the scope of OS level audit, which does not include applications audit, hardware changes, network changes and etc. these extra audits need to be enabled individually if it is possible and applicable. for example, server memory adjustment can be audited if the server's audit is enable (normally can't record who does that), SQL audit must be configured with SQL Enterprise Manager, not from Windows.
hope it helps,
bbao