Tools Tab

Tools Tab is available in the System Configuration utility (Msconfig.exe), but only after you install the 906569 update on a Microsoft Windows XP Service Pack 2 (SP2)-based computer. You can customize the list of tools on the Tools tab to include additional tools, to modify command-line switches or to add both of these functionalities. You can apply changes to the list of tools by using update services such as Windows Update or OEM programs. Additionally, you can customize the Tools tab by editing the Mscfgtlc.xml file that is associated with the System Configuration utility. This is not exactly new, but many don't know about it.

http://support.microsoft.com/kb/906569

Protector Plus

Windows Vulnerability Scanner checks your system for Windows Vulnerabilities. It guides you to update with the right patch to make your system secure. Note: you must give provide an email address in order to download -- and it doesn't have to be a valid one. ;-)

http://www.protectorplus.com/download/winvulscan.htm