I forgot my computer password, I am trying to install a program and I can't

Can somebody help me? I know my apple ID and password, but I forgot the password for my IMac. I am trying to install a new program and it is asking me for my password and do not remember it. the keychain is the problem and when I try to create one or change it .The computer ask me for my password. What can I do??

Greetings,
See this article on how to reset your password: http://support.apple.com/kb/HT1274
Cheers.

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