This error message will be due to one of two things:
2) You have used DHTML transition effects, and Internet Explorer is having trouble displaying them.
Please check the following things:
- Make sure the "package name" on the Build Web Site screen does not contain any punctuation characters, specifically ' and # can cause problems.
- If you have used DHTML transition effects, try removing them and see if the problem goes away. Unfortunately if this solves it, it means Internet Explorer is not installed correctly. I had this same problem once on my computer, and re-installing Internet Explorer solved it for me. You don't have to re-install Windows itself - it should be enough to go to Microsoft's web site and run the Internet Explorer installer from there.