Lost User Name and Password after fresh install

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http://www.ubuntux.org – I had took this installation into my hands as a beginner and failed to keep track of my user name and pass word due to other computer complications and not using paper. I was given a installation disk version 9.4 if i do recall Fully installed over winXP Was very unsure with the installation to begin with as it was my very first ,i was able to log in until i shut down the machine and tried using it the next day. I do not have this installation disk anymore as it was loaned to me. The computer has been sitting for some time now and has been pretty much rendered useless seeing how i can not fix this with out some assistance. It boots up to a black screen sometimes freezes and other times it boots up to the usual ubuntu user name and password fields. I wish to get this machine back up and running some how any advice? (Distributions)