After dealing with some viruses and spyware, you may have come across a situation in Internet Explorer where the default prefix “http://” is missing. For example, if you type in www.windowsreference.com into Internet Explorer, it will never add the “http://” in front
go to Start>Run> type regedit press enter
Now you need to navigate to the following key from the left pane
and look in the right pane, there will be only one key, what is its Value Data,should be “http://”which is the deafult value.
That’s it now it should work without any problem
Some other useful values