I have had problems when I click on an e-mail link in a web page. I get 64 Internet windows opening and then I get told that my default e-mail is not installed properly. When I went to regedit HKEY_CLASSES_ROOT/mailto I discovered that I cannot open mailto to add a new string (URL Protocol). I get an error message cannot open mailto. Error while opening key. I don't know what to do. Can you help me?