Download Adobe Creative Suite 2 legally for free from Adobe
Adobe is giving CS2 away fro free from their website. Including Serial Numbers – but no support.
It works even on Windows 7 and current Mac OSX – but you have to fiddel around a bit.
But still – Photoshop CS2 and the Professional Acrobat etc. is worth it.
Update: You might only use this versions if you have a valid license.