Sounds like someone did a little "maintenence" on your computer, like improperly deleting programs.
To remove a program no longer needed, you would want to either use the 'uninstall' program that may have been included in the install of the application.
OR you would want to uninstall a program with the "Add/Remove programs" applet in the Control Panel. In Windows 2000, goto START, SETTINGS, CONTROL PANEL, and select Add/Remove Programs. Then find the application you want to remove, and click 'remove'.
This way, the program files, and all registry references to that program are removed from your machine. As it stands now, your machine still thinks the program is on you computer, and is trying to find the .dll file for that program that it is suppose to load at startup. You get that error because it cannot find the file.
But it looks like it is a 'Wildtangent' related program file. I *think* Wildtangent is a adware or spyware program. I try not to have Wildtanget stuff on my computer.
I would suggest you go to Kim Komando's site (Komando.com) and in her Shareware section, you can find where to download Adaware, and Spybot Search and Destroy. Both programs remove adware and spyware, and might take care of your problem. Otherwise, you may have to reinstall, then properly uninstall the program the .dll file is associated with (if you know which one it is).