Thanks all who were trying to help.

I finally figured it out.

Here is what I did:

sudo gedit /usr/local/bin/mountscript.sh

In Virtualbox make sure to create a share for what ever drive you want to access (mine is C), and name the share C. Oh, and make sure it is marked permanent.

Paste in this and save (make sure and replace [UBUNTU_USERNAME] and [WINDOWS_USERNAME] with their respective usernames):

#!/bin/bash

sudo mount -t vboxsf C /media/C

sudo mount --bind /media/C/Users/[WINDOWS_USERNAME]/Documents/ ~/Documents/

sudo mount --bind /media/[UBUNTU_USERNAME]/C/Users/[WINDOWS_USERNAME]/Documents /home/[UBUNTU_USERNAME]/Documents

Then to make it executable run this:

chmod +x /usr/local/bin/mountscript.sh

Then to make sure you do not have to enter your password each time you boot:

sudo visudo

Then at the end add this:

[UBUNTU_USERNAME] ALL=NOPASSWD: /usr/local/bin/mountscript.sh, /bin/mount

Then open the dash and search for: Startup Applications.

Click add, and in the name field type: Mount Script

In the command field type: /usr/local/bin/mountscript.sh

Click add. Close out everything and reboot!

Hope this helps!