Adobe Flash Player & passwords

Question

A pop-down asked me if I wanted to update Adobe Flashplayer. Unfortunately, I said yes.
Now I can’t play any videos on the internet.
When I tried to access Adobe Flash Player, it asked for my password – but didn’t accept the one I entered. If I try to uninstall Adobe Flash Player, I also need a password.
I found my apple ID and re-set my password by going to
https://appleid.apple.com/cgi-bin/WebObjects/MyAppleId.woa/
I was advised that my Apple ID password had been reset.
When I went into System Preferences, though, and tried to set my Apple ID - my new password was ‘incorrect’.
To ‘Change password’, I need to know the old password – which I don’t.
Also, the lock is shut and I can’t click it open ‘to make changes’. The ‘Allow user to reset password using apple ID’ box is not ticked. 

Answer 1

When being prompted for passwords to install/remove Flash it is your Admin password not your Apple ID password you're using - yes?
You may want to start over with Flash by using Adobe Flash Player Install Manager in your Utilities folder. When prompted for a password use your Admin pw.
Download the latest version of Flash direct from Adobe: http://get.adobe.com/flashplayer/
Once installed, and if you are using Safari, make sure that Enable Plugins is ticked in Safari Preferences>Security tab.
For your Apple ID (not your computer admin pw) have a look at Keychain Access in Utilities. Click on Passwords and then find the entry 'daw.apple.com...........', select it, click the show password box, enter your Admin pw at the prompt and it should show you your Apple ID pw (I think the information I'm giving here is correct). That should confirm what you think your Apple ID pw is.
Then do a restart and try logging in to your iTunes or Mac App Store account.
If that doesn't help resolve your Apple ID problems, not sure what to suggest next other than re-visiting:
https://appleid.apple.com/cgi-bin/WebObjects/MyAppleId.woa/