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Thanks crossroads, I tried temp blocking the firewall but I still couldn't get on to it.
I feel like it's something to do with this IIS thingy as on the cannot access page lower down it mentions:
Go to Microsoft Product Support Services and perform a title search for the words HTTP and 403.
Open IIS Help, which is accessible in IIS Manager (inetmgr), and search for topics titled Configuring ISAPI Extensions, Configuring CGI Applications, Securing Your Site with Web Site Permissions, and About Custom Error Messages.
In the IIS Software Development Kit (SDK) or at the MSDN Online Library, search for topics titled Developing ISAPI Extensions, ISAPI and CGI, and Debugging ISAPI Extensions and Filters.
If it comes to it I am sure I can find someone to fix it at work or something - it's just a bit annoying. I do appreciate your help, by the time this evening's over and when I do get it sorted, I will probably require the yahoo dating service, ha ha ha.