I tried this but the only problem I am having is that I no longer have my old computer, just the hard drive. I've connected it to my new computer but the registry editor only allows access to the primary hard drive and not the external one, I have to search the old drive and load the file manually and this is where I am having trouble. I don't know which file has the registry key.
Did you register at thesims3.com ? If so, you can try to look them up on there. Product code = Serial Code.
Here's a link: http://club.myce.com/f3/reading-windows-registry-external-hdd-126488/ but it sounds like yo need to be a bit of an advanced user so you don't mess stuff up (or here: http://www.alanhart.co.uk/archives/2011/01/31/access-registry-on-another-external-hard-drive/ )
