I am not sure what you did or why, but Unity is in the repositories. Once
installed it will say Ubuntu Netbook Edition in the Session Menu. You can
also install Unity 2D, but you need to add a PPA to your repository.

www.ubuntugeek.com/...ty-in-ubuntu-10-0410-10.html
www.techienote.com/.../...-unity-2d-on-ubuntu.html

If you want to try it as it is in 11.04, then your best bet is to do it in a
VM. However, you can only get the 2D version to work because Compiz requires
more than 128 MBs of graphics memory and VirtualBox can only give that as a
maximum. I have heard that VB 4.04 allows Ubuntu 11.04 to work but have not
tried it.

You can get it by installing testdrive. Add the ppa first then install
testdrive. You need Virtualbox to run the virtual machine. Testdrive is
really a Natty appliance set to run in a VM.
https://launchpad.net/~testdrive/+archive/ppa

Right now I can't do anything because I can't get into Ubuntu. I get that error
I mentioned when I try. I'm just trying to get my system up and running again.

Oh, and when I tried to search for Unity, all that came up was a multi-theme
package that had a Unity theme in it.

But getting my system back intact is all I care about right now.

Do you still have your Ubuntu CD? Or any other Linux CD? Step one
will be to boot into a live desktop and backup the files that are
important to you. Then take a look at post 30 in the following thread
and see if that works for you.
ubuntuforums.org/showthread.php?t=1474253&page=3

note:
1) before trying to edit grub.cfg, back it up. "sudo cp
/vdisk/boot/grub/grub.cfg /vdisk/boot/grub/grub.cfg.bak"
2) I believe these steps are/should get you into Ubuntu from a live CD
or bootable flash drive if you have a WUBI install, which I think you
do. Otherwise, ignore the "/vdisk" part.

I downloaded from Wubi, so no disk there. I do have a disk that came with a
Ubuntu for Dummies book. Not actually a For Dummies, but one like it. I don't
have it with me right now but I will later. I think I read that it can boot as
a live CD. But it's a different version, and I've moved my /home to a new
location. Will that cause a problem? And if I get in and can access my files,
will /home contain everything I need to backup, my music, vids, documents, etc?
And settings and bookmarks and all that?

Yes, as far as I know, home will have everything you need to backup,
with the possible exception of any custom scripts you might have
created and put elsewhere... Regarding the Ubuntu CD you have, it
does not matter that you have a different version from what you
installed. To get into /home, you may have to mount that also from
the gui, once you have mounted root.disk, but I'm not sure as I have
never experimented with wubi. Someone with more experience there can
probably help if you are having trouble...

Once you are backed up and running again, you might want to consider a
full Dual-boot installation. This is a much safer, more stable way to
run Ubuntu if you plan to continue using it long term or as your
primary OS. Much easier to recover from a live CD also...

The CD that came with that book always you to load into RAM memory to
try the Ubuntu or to install it and in the books first section tells you
how to download and burn an ISO of Ubuntu for yourself.

My current desktop and files from my Wubi install will be available to me from a
live distro?

I didn't see anything on post 30 that seemed applicable to me.

This part:

sudo mkdir /win
sudo mount /dev/sda2 /win

Then mount virtual disk
sudo mkdir /vdisk
sudo mount -o loop /win/ubuntu/disks/root.disk /vdisk

When run from a terminal in a live CD, it should mount your wubi install,
presumably at the root level.

I supose it could be "/win/ubuntu/disks/home.disk" if you have home on a
seperate partition, but I am not sure if wubi treats "root.dsk" as an
extended or a primary partition. I would try the above, and see if you can
now see your "home" in "Places" in your menu on the live desktop. Note, it
will likely not be called home, but a string of numbers or something. If
not, try replacing "root.disk" with "home.disk", maybe?

I should have mentioned that you will need to change "sda2" to
whatever partition windows is installed to. Probably sda1. After
that, you should be able to back up. The rest of post 30 is for
fixing the grub error you were describing in your original question.