As it works on Alices machine and not yours, then as we have said it is something wrong with your computer.
1) Open IE, got to settings->Internet Options -> Advanced, then in the botton of the tab RESET
2) If this doesnt work, then there possibly is something else loaded on your computer that is stopping access or trying to redirect you somewhere you are not really trying to get to.
I agree with Mike and Trevor. Leon, Have you/can you download say, Firefox? See if the fault replicates. It is smelling like a browser issue withyour pc to me.