How can I reset my admin. password without the MAC OXS  reinstall, bought mine used and have no such disk

Hi, how can I change my admin password without the reinstall of MAC OXS disk or whatever that is, I bought my macbook privately and cant update my adobe flash without the password which I have never set up. but anything I type in is wrong...... as a password.

ok have read all relivant posts and have tried the restart command+R which does absolutely nothing. My Computer opens up as usual.
I have found another response which suggests command+S and generate an entirely new admin. and password and you are not supposed to loose a single file.
Has anyone done this and been successful? I have just installed a new hard drive in the last 3 months and don't want to do any damage.
Hearing a success story would be nice.  Thanks

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