If your NT system is vulnerable to attack from within your organisation or from the outside, check out the latest post-Service Pack 5 "hotfixes"; three of these prevent miscreants from exploiting flaws that could bring your system to its knees. To get them, visit www.microsoft.com/security/bulletins/current.asp. You can also find post-SP5 fixes, installation instructions, and related Knowledgebase articles at ftp.microsoft.com/bussys/winnt/winnt-public/fixes/usa/nt40/Hotfixes-PostSP5.