Macbook Needs to be wiped out and reinstalled

I have a Macbook here with problems. Somehow my password was changed and i cant get into the laptop.
How can I change the account password? or
How can I wipe the Macbook out and reinstall OSX? all i have is the OSX install discs that came with the macbook. Can this be used to install OSX again? When i put the disc in, it says "Cannot use this disc to install".
Any help?

NO i can get into the administrator account, but when i reset the password for my account, it says that it saves, but when i go to login with it, it says that you cannot login to that user at this time. I need to be able to reset that password and login, or wipe out and reinstall. I only have a friends disk set to reinstall OSX. Will this work? Same laptop (macbook 1.83 duo)

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