Moving XP to a different machine(legally!)

I have a Compaq Evo laptop with XP Home installed and something like 200 pieces of software also installed and working correctly (I demo software for education) I now want to transfer all of this to a new (faster) Compaq laptop.
Because it took weeks to get all the software in, I am reluctant to install it all again bit by bit, so I thought the sensible thing to do would be to copy everything onto the new hard drive (or simply swop hard drives)

When I swopped hard drives XP recognised the hardware had changed and didn't want to play ball.

Obviously, I have XP Home licences for both machines, so is there anyway I can achieve this without re-installing all my 200 pieces of software? Can I make XP accept the 'new' product key from the second machine, or reactivate it in some way?

Needless to say, I don't want to do anything illegal (I have 2 licences)

Please help someone! It took me about 6 weeks to install all my software the first time - I dread doing all that again!

Have you tried using the Files and Transfer Wizard ??

Step-by-Step Guide to Migrating Files and Settings

When you try to relicense it on the web does it offer you the choice of calling microsoft. Explain the situation...they are usually pretty good at helping. A local number or 1-800 number should be listed in the options.
Best of luck.