How do you enable view source in ie8 when it gets magically diabled

I have multiple computers that all seem to have View Source disabled from the content menu when you right click on a web page. Now I know it's not that the web page is some how disabling it, I'm pretty sure thats not even possible. But alas I have at least 3 machines in my office (not on AD) that have this problem. I have also worked on clients computers that have this same issue. It's down right maddening!

I tried to Google for it, but it just shows results from the dawn of IE6 in all of it's "glory" with a bug where if the cache was full it would be disabled. But this is not the case in IE8.

Any body have a clue why this is happening, or a fix for it? Maybe a reg setting?

Update:
So I got a little closer to solving it, but there was still an issue on one computer where it allowed it not is HTTP, but not in HTTPS. One other computer works correctly in both. I Found these two keys missing in the registry:

[-HKEY_CURRENT_USER\SOFTWARE\Microsoft\Internet Explorer\View Source Editor]
[-HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Internet Explorer\View Source Editor]

is it happening for https sites? if so try tools - Internet Options - Advance go to security tab and check-off Do not save encrypted pages to disk.

Try Bing search insted of google, it gives more proper search result (atleast for this.)

I had the same problem on Oracle i-store (on IE8) and following solution can be used as a workaround on secure (https) pages:

once the secure page is displayed, go to: Tools-->Developer tools --> View tab --> Source --> original