HELP, My PC's motherboard broke :(

But luckily the hard disk is still working so I switched it to another machine. The problem is that I can access the softwares that I installed on it but I cant run (most) of them. Is there a solution for this? I installed legit versions of Mail Mascot and TweetAttacks Account creator and now Im not able to remove the licenses to install them on another machine. My OS is WinXP Pro. Any suggestions are greatly appreciated.

T.I.A

There is a MS way, you lose only the windows updates (and most other updates directly from MS) so you will have to redownload them again if you need them:
http://support.microsoft.com/default.aspx?scid=kb;en-us;824125

And there is an alternative way, but it requires that you can still use the old motherboard:
http://arstechnica.com/hardware/news/2007/09/how-to-install-a-new-motherboard-without-reinstalling-windows.ars


NOW READ THIS:
Don't use your original HDD for the described changes as they can mess up things badly and you still lose all your data. Instead, search for some cloning, aka ghosting software that can make an exact image of your HDD on another HDD. Then use that second HDD to try and use the same installation with another motherboard.