mine hasn't come back at all.
Behind - um, try pressing F1 and it will tell you which version of Internet Explorer you are using, if you are. (Mine is IE8, for e.g.) Or you might have Firefox loaded instead - dunno how you'd know that, sure someone else will!
MN version - go into Customise at the top of the page and see which version matches what you normally see
Hardware - are you on iPad, Mac, laptop running Windows, laptop running some other operating system, Blackberry, or whatever other options there are for getting on the internet.
HTH