XP and Vista Notepad

Quick problem
When i got a new MOBO i went to Vista and did a fresh Vista install, previously i had XP sp2. I copied all my files to dvd's and then copied them back onto the new setup. Now if i open up a word or notepad document i created on the XP setup it opens up a blank document in the Vista setup?????
Any ideas?
All of my uni work (3 years worth) now just opens up as blank documents
When i got a new MOBO i went to Vista and did a fresh Vista install, previously i had XP sp2. I copied all my files to dvd's and then copied them back onto the new setup. Now if i open up a word or notepad document i created on the XP setup it opens up a blank document in the Vista setup?????
Any ideas?
All of my uni work (3 years worth) now just opens up as blank documents
