Welchia/Nachi Worm Patch Central

If your computer is running Windows2000 or WindowsXP, follow the instructions on this web page.

If your computer is running Windows95, Windows98, WindowsME, or WindowsNT, MacOS, or Linux, your computer is not vulnerable to the Welchia/Nachi worm, and you do not need to inoculate your computer against it, however, you should still regularly update your computer using Windows Update (see Steps 3 and 4).

You can read more about this worm at Symantec's web site here: Symantec Security Response - W32.Welchia.Worm.

Confused? Need help? Call the Computer Support Center at x5999.

We have assembled some of the most frequently needed patches and tools to inoculate your computer against the Welchia/Nachi worm, and to remove it from your computer if it is already infected. These tools are located on our campus server, and should download much more quickly than if you were to retrieve them from the Internet. If you get a warning that "This type of file could harm your computer if it contains malicious code" -- that's normal, you're downloading a ready-to-run program -- just save it to your desktop and run it.

Step 1: Inoculate your PC from reinfection
Download and run the appropriate patch for your computer:

WindowsXP:
Install the WindowsXP Welchia Patch

Windows2000:
First install Windows2000 Service Pack 4 (required)
Then install Windows2000 Welchia Patch

Step 2: Run the Welchia Removal Tool
Download and run Symantec's Welchia Removal Tool:

Windows2000 and XP:
Run the Symantec Welchia Removal Tool

The tool will scan your computer and report either that your computer is not infected with the worm, or that it has removed the worm. You can find more information about the removal tool at Symantec's web site: http://securityresponse.symantec.com/avcenter/venc/data/w32.welchia.worm.removal.tool.html

Step 3: Install and Maintain an Anti-virus Program

An anti-virus program can alert you if your computer is being infected with a virus, and can usually prevent the infection from being successful. We recommend Symantec's Norton AntiVirus.

Step 4: Use Windows Update to Help Keep Your Computer Safe

Regularly using Microsoft's Windows Update system will keep your computer patched-up so that it will be less vulnerable to attack as new threats emerge. On most Windows computers, you'll find Windows Update right on the Start menu. If your computer does not have this feature in the menu, just start your web browser and surf to http://windowsupdate.microsoft.com.

University of Hartford
Information Technology Services
Computer Support Center: x5999