This tip from www.slipstick.com/problems/link_restrict.htm solved the problem.
"If you received this error after uninstalling any application that takes over the HTML open command (including, but not limited to, Chrome & Firefox browsers) you may also need to change the HTM/HTML association in the registry.
1.Start, click Run, type Regedit in the Open box, and then click OK.
2.Browse to HKEY_CURRENT_USER\Software\Classes\.html
3.Right click the value for the .html key and select Modify...
4.Change the value from "ChromeHTML" to "htmlfile" (or from FireFoxHTML to htmlfile)
Repeat these steps for htm and .shtml keys if they exist. You may also want to check the xhtml and xhtm keys.
This post has been edited by rbbaron: 20 August 2010 - 07:14 AM