ITunes Locked On iPod Screen PLEASE HELP!

Question

Okay, so I recently bought a new computer, and I downloaded all of my iTunes software onto the new one. My other computer doesn't even turn on anymore, so I can't access it at all to back up my files. I have 85 songs on my iPod. (It's a nano, if that makes a difference.) When I plug my iPod into my computer, it charges fine, and it says Do Not Disconnect for a while, but nothing updates. iTunes does recognize it, but when I click on it in the side bar in iTunes, all of my songs are gray and I can not click on them. Then at the small bar on the bottom which tells you how much space is taken up on your iPod, it has a little lock next to it. I am assuming my iPod is locked. The hold button is NOT on. I tried resetting it, by just switching the hold button, and holding the menu and select button, and it reset, but it doesn't work. I had my friend plug in HER nano, and all her music is normal and it is not locked. (There isn't a lock symbol near the memory bar at the bottom.) I think I may have locked it by accident and I don't know how to unlock it!! All my music plays and it is completley normal, except for that I can't load any music onto my iPod or take music from my iPod and put it into my computer.
PLLLLLEASE HELP! I WANT IT TO WORK!

Answer 1

"all of my songs are gray and I can not click on them"
Grey text when you look at the content and lock symbol at the bottom of the screen simply shows that your iPod is set to "automatically update songs and playlists". . If you want to access your iPod directly, play it through your iTunes, connect it to a second computer etc. you just need to change the update method to "Manually manage songs and Playlists" in the iPod preferences. For more detail see this tutorial: Managing Your Songs Manually
One thing to be aware of with manually updating is that the iPod also has to be manually ejected before the "Do Not Disconnect" message will go away. Safely disconnect iPod
For info: iPod 101
The iPod offers three ways to transfer music from your computer. You can select one of the following update modes from the iPod Preferences menu in iTunes (Edit=>Preferences=>'iPod' tab):
1) Automatically update all songs and playlists. This is the default mode, in which your entire music library, including playlists, is automatically synced to your iPod. If the music library on your computer exceeds the iPod storage capacity, you are prompted to select a different update method.
2) Automatically update selected playlists only. With this option, iTunes automatically copies the playlists you have selected to the iPod when you connect it to the computer.
3) Manually manage songs and playlists. You can also choose to transfer music to the iPod manually. This allows you to drag and drop individual songs and playlists from iTunes to the iPod.
"All my music plays and it is completley normal, except for that I can't load any music onto my iPod or take music from my iPod and put it into my computer."
In manual mode you will be able to drag and add songs to your iPod. However you can't sync or drag your music back directly from an iPod to iTunes, the transfer of music is designed by default to be one way from iTunes to iPod.