In the browser Menu->More->Settings-> Uncheck Mobile view. If that doesn't work, you can actually change the UAString by typing about:debug in the address bar, then going back to settings. At the bottom, you will see settings under the "Debug" heading. Click the dropdown for UAString and select Desktop. You can also look up the different strings specifically used for IE and manually enter a string.
But like I said, not everything works in the android browser even if you can fool a website into thinking you're using IE (it might need plugins, etc.)