Administrator's name and password - unable to make changes

I just bought my Macbook about two weeks ago, created a administrator name and password, and it worked just fine. However, for the past couple of days, I'm noticing that I cannot make any changes with Software Updates because when I type in the (CORRECT) name and password, the window says "You must type an administrator's name and password to make changes to Software Update. Please try again." Yes, I've BEEN typing the correct name/password. I've tried resetting the password which works fine, but when it comes to inputting it into a window, my macbook doesn't seem to read what I type in. Does anyone know what is going on here? Please help....

Reply to maurobras.
Seems to me that you have the lost admin problem.One of Leopard'd little ways I have experienced myself. That is the subject of many posts here. Situation (if I am correct in my supposition) is not that you have entered a wrong password, but that what you thought, and what had been till then, was a password of an administrator was not because Leopard had downgraded that user to a non admin.
Look up ' lost administartor' or such in the postings. Put the Leopard install DVD into the machine when booted up.>>>Restart holding down C key. This boots from the install disk. Do not install but look into the menus for the 're set password' option.>>> Choose to re set the root password>>> Write down a good PW for root and write it down.>>>Reset the root password>>>Close the DVD and log in as root with said PW.>>>As root go to System Preferences>>Open the little lock and choose the account that should be an admin>>tick the little box 'allow to administer..'>>>log out of root>>>log in as admin>>open application Directory Utility>> choose to disable root (a safety procedure). You should find now in Sys Prefs that the account IS an admin. Some have found problems getting an option to disable in Directory Utility in that case there is a aTerminal command, disenable root, that works. Make sure of syntax in any Terminal command. Look up man disenable.

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