Forgot admin password on MacBook Snow Leopard, Install disc is stuck

Can someone please help - I reset my password to my computer (have no idea why), and I must have hit a wrong key in doing so.
Now, I cannot log in - I installed the Original disc from Apple, and now it is stuck in the laptop.
When I open the computer, the screen I see is the log in box, with my name, but I do not know what key I
mis-typed in the password. Have tried all variations, no luck.
Thank you, SO much, in advance for help.

Are you using a retail 10.6 disk that looks like this?
and not the gray install disks that look like this? The Gray Disks are machine specific and only have the drivers for the Mac that they shipped with.

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