In its security bulletin summary for July 2008 Microsoft reports no critical vulnerability updates in its operating systems / applications. Four important updates are published.

A summary describing briefly the vulnerabilities is available from Microsoft’s Security Bulletin Summary for July 2008.
From this page you will also find links to more detailed information in Microsoft's Security Bulletins MS08-037 - MS08-040.

Updates that fixes the vulnerabilities are available from Windows automatic update mechanism for systems that support this. Alternatively, one may download updates from http://windowsupdate.microsoft.com.  

Norman advices all affected users to download the security updates, to be protected from potential exploits.