Keyboard remapping

[snips86x]

I've got an american keyboard which has been setup to use the UK language, but I'm missing the pound sign on numeric 4.

Can you recommend some software for remapping the keyboard? Ideally I would be looking to map just the one key - number 4.

Thanks

 

[snips86x]

Microsoft Keyboard Layout Creator 1.4

http://www.microsoft.com/en-us/download/details.aspx?id=22339

Thanks for that, it worked a treat