Odd problem that I noticed one day; applications that use HTML or some XML variant to render content now have that content displayed as text, such as desktop gadgets & computer management. I have linked a screenshot to better explain the situation.
The "Extended" services view is messed up, "Standard" works fine though.

A portion of my desktop where a gadget is supposed to be displayed:

Any ideas to where I should look for a problem, i.e corrupt DLL, registration of a control etc would be appreciated.
Edit: I tried "removing" IE8 from "Turn Windows features on or off", followed by a required restart, turned it back on, followed by a required restart. Nothing changed; various applications that use web content still display source code. This is a serious problem now, because a plugin I use in Eclipse is also displaying code instead of various screens.

Internet Explorer 8quite easily. It's in the Control Panel, underPrograms and Features. – Randolph West Nov 25 '10 at 5:45