Hello, my name is Dan.
What you need is some maintenance. There are three things I want you to do.
The first one is to reset the PRAM, restart then press and hold these 4 keys down, 'Option', 'Command(Apple)', 'R' and 'P' keys, keep them down until you hear 4 startup chimes then let go.
This resets all of the system busses, USB, Optical drive, Firewire, display etc.
Please make sure that you hear 4 startup chimes.
The second thing I want you to do is called a Safe Boot.
For a Safe Boot Restart, and before the First Chime Press and Hold the 'Shift' Key, until You See the Apple Logo and the Spinning Gear Appear, Then Let Go.
When You Reach the Login Screen, It Will Say in Red on the Login Window SafeBoot, Login and Give It a Few More Minutes to Finish Loading.
This will take considerably longer to boot that what you are used to. Please give it the time it wants it could take as long as 20 minutes.
The third thing I want you to do is to Repair Permissions, do this with Disk Utility found in Applications/Utilities, it will look like this.
You can find this using spotlight.
After that finishes then you can quit Disk Utility, and restart. Now things should be back to normal the way they should be.
Please let me know.
Okay, that is fine. I will happily clarify and answer any concerns. So you let me know when you want to begin.