Macbook Pro keeps asking for password?

I recently turned on my Macbook Pro after it being dormant for a few monhts. And a few things were odd about it. I had to restart the battery because it wasn't charging properly, then it would get stuck at the loading screen with the Apple Logo and the swirling icon, next it was running extremley slow and now everything seems to be ok, all save for the fact that it won't let me remove or install any new software. I noticed this when preparing my MBP for Mountain Lion because it would continuously ask me for my password to install an update, but no matter how many times I typed it in (and it accepted), the MPB would not install the update. I got errors about this too, how I do not have permission to remove certain programs.
I'm at a loss here because I've purchase Mountain Lion but now I can't update it!
Thank you!

How large is your hard drive and how much hard drive space do you have left?
I got errors about this too
What errors?

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