When you click a hyperlink in Microsoft Outlook or other Office applications, you may receive the error "This operation has been cancelled due to restrictions in effect on this computer. Please contact your system administrator.". This, in most cases is caused by broken .html, http or https protocol file association.

To resolve the problem (assuming Internet Explorer as the default web browser), use these steps:
For Windows XP
1. Click Start, Control Panel, double-click Add or Remove Programs
2. Click Set Program Access and Defaults
3. Click Custom
4. Under Choose a default Web browser, select Internet Explorer
5. Click OK
For Windows Vista and Windows 7
1. Click Start, and click Default Programs
2. Click Set program access and computer defaults
3. Click Custom, select Internet Explorer and click OK

4. Close and re-open Microsoft Outlook.
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THANKS A MILLION !!! IT WORKED !!!! YOU are AWEsome!
It worked, it worked, it worked! Thank you so much for this info, and a pox on the house of Google Chrome!
Tried your method but had no luck. I have Windows 7 Home Premium and Outlook 2010. Very frustrating bug!!!
I have had this problem in outlook for months and cannot get it fixed. Try every suggested solution, nothing.
I cannot get this to work on my pc at all still have the same message can someone help as its very annoying.
Tried your procedure several times and it does not work.
I have Windows 7 and Outlook 2007.
Any suggestions?
ditto Cathy & Evie’s comments – had tried various tactics & spent quite a bit of time researching the problem but no luck, so thanks a million for this fix!! :-)
Brilliant thank so easy when you know how
Thanks so much! I’ve been trying to repair this for weeks! I’ve been in the reg, all through IE, ran Outlook for XP3 compatibility…. everytwhere! This solution works! Instant repair. Thank you thank you thank you!!! :-D