Help~? itunes won't install -- "install interrupted"

Okay so I'm having issues with my itunes.. I've been using itunes for the last year or so on this computer and then yesterday I had some issues with some other programs. When I finally managed to fix those problems, suddenly my itunes wouldn't work anymore, when I clicked the icon it said something along the lines of the action could only be performed with programs that were installed. Long story short, I spent about 7 hours trying to figure out why it said it wasn't installed when my add/remove programs and stuff said it was still there. It wouldn't let me remove itunes, saying something about a installer msi something not being found. After searching around the web, I finally found how to get itunes off my computer.
But now... I can't reinstall it. I've followed a bunch of directions from searching the issue and tried to find solutions.
The error I'm getting is

Itunes Installer Interrupted

The installer was interrupted before the requested operations for itunes could be completed. Your system has not been modified. To complete these operations at a later time, please run the installer again.

I've searched this-
I've run the install clean up tool, I've emptied my temp files, I've uninstalled quicktime and anything related to itunes in my computer/program files/etc. The only other thing I've read to do is completely re-install windows... and I really don't want to do that for fear of losing a lot of pics/vids/music/stuff on my computer.
So I'm willing to wait a few days and see if anyone can help me before I resort to that.

Please help, I'm so frustrated with all this and would greatly appreciate anything anyone could offer on how to fix this.
Thanks.