Maybe my issue is more easily solved...(I hope)! When I'm trying to install/uninstall latest Adobe Flashplayer, the password I'm using is not being accepted and I just reset the password! So I'm stuck not being able to even begin trying to solve this issue. Of course, Flashplayer stopped working after I upgraded to OS Yosemite on my Mac as with many other people.
I'd appreciate whatever suggestions anyone has!!
I've branched your question to a new discussion, since it was unrelated to the previous issue:
This password prompt is presented by your operating system, and is intended to keep you from accidentally installing software.
If this is your personal machine and you don't need a password to log into the computer when it first starts up, you can probably leave the password blank and click OK to get past this prompt. If this is your personal machine and your normal password isn't working, check to make sure that CAPS LOCK is off, and type the password carefully.
If this is your work machine and it's asking for an Administrator password, well, you'll need to have a conversation with your friendly IT person.
If you're still stumped, you may need to reset the password on your Mac: