Unable to open hyperlinks from Windows Mail/Outlook/Office in Windows Vista

Unable to open hyperlinks from Windows Mail/Outlook/Office in Windows Vista

Error-” This operation has been canceled due to restrictions in effect on this computer. Please contact your system administrator.”
Error-“Windows cannot find”URL”
 
Resolution:

• Open Control Panel
• Open Default Programs
• Click “Custom” and then Default Browser
• Set Internet Explorer as the default browser
• Click “OK”

Other options you can try:

• Change the Default key value in Registry.
• Open HKLM\Software\Classes\.html
• The Default value of this registry should be “htmlfile” .
• We can manually change this value. There is another way to change this value.
• Click on Start >Programs >Default Programs.
• Click on “Set program access and computer defaults”.
• Under Choose a configuration , Click on “Custom” option.
• In “Choose a default web browser” click on “Internet explorer” and click on OK.
• Now close your IE and Outlook if they are open. Then open Outlook again to test.
• 1. Open Explorer
  2. Select Tools and then Folder Options
  3. Select the File Types tab
  4. Select Extension: (NONE), File Type: HyperText Transfer Protocol
  5. Click Advanced toward the bottom of the window
  6. In the Edit File Type window, select open and click Edit
  7. Clear the DDE message box (which should contain “%1″)
  8. Click OK, Click OK
  9. Repeat for File Type: HyperText Transfer Protocol with Privacy
• OR This if the above steps don’t work.
• 1. Open Windows Explorer (or My Computer).
  2. Go to Tools -> Folder Options -> File Types
  3. Select Extension: “(NONE)” File Type: “URL:HyperText Transfer Protocol”
  4. Click “Advanced”. In the “Edit File Type” window, select “open” and click “Edit”
  5. Uncheck “Use DDE” (the dialog should then hide the lower part).
  6. Click OK for that dialog and the next one (afterwards, the “Use DDE” box is still checked but the “DDE Message” box will be cleared, as shown here)
  7. Repeat for Extension: “(NONE)” File Type: “URL:HyperText Transfer Protocol with Privacy” (and any other protocols you want to fix)
  8. Repeat for Extension: “(NONE)” File Type: “Firefox URL”
  9. Repeat for Extension: “HTM” (or “HTML”) File Type: “Firefox Document”

• Reset Internet Explorer Settings in IE7.0
• In Internet Explorer, click Tools menu > Internet Options.
• Click Programs tab, click “Make Default” and check “Tell me if Internet Explorer is not the default web browser.”
• Switch to Advanced tab, click Reset button and then click Reset to confirm.
• Uncheck the “Enable third-party browser extensions” option in the Settings box
• To fix this problem in Windows XP and Vista, you need to edit the registry.
  Go to Start > Run > type regedit and click OK. Navigate to HKEY_CLASSES_ROOT\FirefoxURL\shell\open\ddeexec.
  At the right pane, double click the (Default) name to bring up the Edit String window. You should see the data value “%1″,,0,0,,,,.
• 
  

If this doesn’t work try this:

1. Go to "Start -> Run" (or press the windows key+R) then type regedit and click OK
2. Use the directory tree hierarchy to navigate to "HKEY_CLASSES_ROOT\HTTP\shell\open\ddeexec"
3. Delete the "ddeexec" registry key
4. Repeat for "HKEY_CLASSES_ROOT\HTTPS\shell\open\ddeexec" (and any other protocols you want to fix)
5. Repeat for "HKEY_CLASSES_ROOT\FirefoxURL\shell\open\ddeexec"
6. Repeat for "HKEY_CLASSES_ROOT\FirefoxHTML\shell\open\ddeexec"

OR
Create a *.reg with the following contents

Windows Registry Editor Version 5.00

[HKEY_CLASSES_ROOT\FirefoxHTML\shell\open\ddeexec]

@=""

[HKEY_CLASSES_ROOT\FirefoxHTML\shell\open\ddeexec\Application]

@="Firefox"

[HKEY_CLASSES_ROOT\FirefoxHTML\shell\open\ddeexec\Topic]

@="System"

[HKEY_CLASSES_ROOT\FirefoxURL\shell\open\ddeexec]

@=""

[HKEY_CLASSES_ROOT\FirefoxURL\shell\open\ddeexec\Application]

@="Firefox"

[HKEY_CLASSES_ROOT\FirefoxURL\shell\open\ddeexec\Topic]

@="System"

[HKEY_CLASSES_ROOT\HTTP\shell\open\ddeexec]

@=""

"NoActivateHandler"=""

[HKEY_CLASSES_ROOT\HTTP\shell\open\ddeexec\Application]

@="Firefox"

[HKEY_CLASSES_ROOT\HTTP\shell\open\ddeexec\Topic]

@="System"

[HKEY_CLASSES_ROOT\https\shell\open\ddeexec]

@=""

"NoActivateHandler"=""

[HKEY_CLASSES_ROOT\https\shell\open\ddeexec\Application]

@="Firefox"

[HKEY_CLASSES_ROOT\https\shell\open\ddeexec\Topic]

@="System"

[HKEY_CLASSES_ROOT\ftp\shell\open\ddeexec]

@=""

"NoActivateHandler"=""

[HKEY_CLASSES_ROOT\ftp\shell\open\ddeexec\Application]

@="Firefox"

[HKEY_CLASSES_ROOT\ftp\shell\open\ddeexec\ifExec]

@="*"

[HKEY_CLASSES_ROOT\ftp\shell\open\ddeexec\Topic]

@="System"

[HKEY_CLASSES_ROOT\gopher\shell\open\ddeexec]

@=""

"NoActivateHandler"=""

[HKEY_CLASSES_ROOT\gopher\shell\open\ddeexec\Application]

@="Firefox"

[HKEY_CLASSES_ROOT\gopher\shell\open\ddeexec\Topic]

@="System"

----cut----

Or Just install the latest version of firefox and uninstall it using revo uninstaller. Installation of a newer version of firefox will create the following subkeys which should fix the problem.

[HKEY_CLASSES_ROOT\HTTP\shell\open\ddeexec]

@="\"%1\",,0,0,,,,"

"NoActivateHandler"=""

and 

[HKEY_CLASSES_ROOT\https\shell\open\ddeexec]

@="\"%1\",,0,0,,,,"

"NoActivateHandler"=""

I tested very small changes and found that resetting (AGAIN) 

these two entries to:

[HKEY_CLASSES_ROOT\HTTP\shell\open\ddeexec]

@=""

"NoActivateHandler"=""

and

[HKEY_CLASSES_ROOT\https\shell\open\ddeexec]

@=""

"NoActivateHandler"=""

If nothing else works follow the following steps to perform a repair of Windows Mail in Vista