Im having this weird problem in magento, when i try to log in the admin i was seeing this
The requested URL /js/js.php was not found on this server.
Apache Server at example.co.uk Port 80
check your first lines in index.php in the root. In my case there was something placed by eclipse. Something like $x15='http://boatandyachtbuyer.co.uk'
I have deleted all these strange variables. Works like a charm.
Hope it helps.