Booyah! 

Thanks for your help Witch! Working! xx

I have never had an issue in the past

I have both the most recent versions of both the decrapper and the game.
The only way I can make it run, is through downloading and placing the .world file into C:\ProgramFiles|\TheSims3\GameData\Shared\NonPackaged\Worlds
(but as I previously mentioned, although I can play the game, the lot/sims names look scripted)

Do you have any constructive suggestions?

I have tried all the Hidden Spring files uploaded and I have had little success.
I had a poke on the EA forums for a poke around and a few people who have actually purchased the world are having similar problems, have you got the most updated version of the game?

I got the world uploaded, and could enter it but all the lots and sims are called ridiculous names so it's unplayable.

It's not even about playing it now it's about the challenge of getting it working! 

I'll continue to play around and I'll post any developments.