This operation has been cancelled due to restrictions in effect on this computer. Please contact your system administrator.

Error:
"This operation has been canceled due to restrictions in effect on this computer. Please contact your system administrator."

Above error appears everytime you attempt to use hyperlink in an Outlook.

Cause:
This is not an Outlook error. The most common cause is a corrupt registry key in Internet Explorer. The registry key found at
HKEY_Local_Machine\Software\Classes\htmlfile\shell\open\command
is either damaged or corrupt.

Resolution:

1 .To Reset Web settings in Windows XP:

1. Open Internet Explorer.
2. On the Tools menu, click Internet Options.
3. Click the Programs tab, and then click the Reset button.
4. Under Internet programs, verify that the correct e-mail program is selected.
5. Click to select the Internet Explorer should check to see whether it is the default browser check box.
6. Click Apply, and then click OK.

If you are using Vista:

1. Open Internet Explorer.
2. On the Tools menu, click Internet Options.
3. Click the Advanced tab, and then click the Reset button.
4. On the Programs tab, under Internet programs, click Set Programs, then "Set your Default Programs", select your e-mail program and click "Set this program as Default". Repeat for Internet Explorer.
5. Click OK and close the dialogs.