Here is another way to deactivate the trojan, along with a description from F-Secure.com:

This two-component trojan was discovered in the end of December 2001. The trojan being installed on a user's system constantly upgrades its main component that connects to 2001-007.com website and reports user's ID, web browser a user is using and all URLs that a web browser and all its child windows open. The trojan violates user's privacy and opens a security hole in a system by downloading and activating executable files.

The main component of the trojan is Explorer.exe file that is located in Windows folder in \Explorer\ subfolder (do not mix with the original Windows' Explorer.exe). This component is constantly upgraded by the second trojan component that has the name 'DlDer.exe' and is located in Windows folder.

The DlDer.exe file is most likely dropped to user's system by ActiveX applet or Javascript code that a user doesn't notice when he is browsing Internet. The exact way how this file is dropped is not yet known. The case is under investigation.

The DlDer.exe file when it is started downloads Explorer.exe file from a website and puts it to \Windows\Explorer\ folder. Then the trojan creates a startup key for Explorer.exe file. On next System restart the Explorer.exe file is activated and it creates a startup key for DlDer.exe file and starts to connect to 2001-007.com website and report user's ID, web browser and all URLs that a user visits to there.

We recommend to delete both trojan components from an infected system. If these components can't be deleted (locked files) they should be deleted from pure DOS (in case of Windows 9x system) or renamed with different extensions (EXA for example) with immediate system restart (in case of Windows NT/2000/XP system).