Unable to install "Mavericks" as it asks for my 'Admin Password" and it does not work. Have not used it since I got my iMac in 2008. First upgrade to do so. Any solutions please?

I have a 2008 iMac which had Leopard initially and I have upgraded to each new OS without a hitch. I downloaded "Mavericks" and began the install, it asked me for my "Admin Password" which I have never ever used since I set the Mac up, I have it safely tucked away so entered it, it rejected it each time. Am sort of lost now, as if my "Admin P/W" does not work here can I go from here?
I have seen many others with this problem but so far most of the solutions seem to be for the "log in" or "User" password not the Admin one.
I am running Mountain Lion successfully.
I have my original disks as supplied and also a Snow Leopard install disk.
I have seen some info about fixing this via Lion Recovery partition which I must have due to using Mt Lion.
How can I repair this situation.
Thank you to all those who respond.

Thanks for your reply.
I have visited both the sites you listed but it seems to me that the solutions mentioned are to fix the User or log in p/w's.They do not seem to refer to the admin one again.
I understand about it being just like other user accts but the fixes do not really refer to it only the above two.
I have no problem booting up my Mac, I do not use a log in p/w so my problem is with the Admin p/w that was set up back in 2008. This is what I need to reset etc.
I am quite confused over these pw's as to just what is what and I need to make sure I understand all before I get into deeper trouble following these links.
This Admin p/w that was set up has never been used and is the only p/w I have except for my Apple ID. All previous upgrades only required my user name log in which has no p/w set up.
I hope you can follow me here butI have read so much on this it is becoming very confusing about whcih p/w's are what.

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