Ubuntu partition does not boot. This started after a power interruption during system boot. The next time I boot, I encountered the following error message:

mount: mounting /dev/disk/by-uuid/3f7f5cd9d-6ea3-4da7-b5ec-**** on /root
failed: Invalid argument
mount: mounting /sys on /root/sys failed: No such file or directory
mount: mounting /dev on /root/dev failed: No such file or directory
mount: mounting /sys on /root/sys failed: No such file or directory
mount: mounting /proc on /root/proc failed: No such file or directory
Target file system doesn't have /sbin/init.
No init found. Try passing init= bootarg.

Busybox v1.18.5 (Ubuntu 1:1.18.5-1ubuntu4) built-in shell (ash)
Enter 'help' for a list of built-in commands.
(initramfs) _

I've searched for similar posts here and most of the recommended solution is to reboot to the Ubuntu LiveCD. That's another problem because I cannot boot to a LIVEUSB, this is the error message I get when booting to a LiveUSB:

Busybox v1.18.5 (Ubuntu 1:1.18.5-1ubuntu4) built-in shell (ash)
Enter 'help' for a list of built-in commands.
(initramfs) mount: mounting /dev/sda2 on /isodevice failed: Invalid argument

Could not find the ISO /ubuntu-12.04-desktop-i386.iso. 
This could also happen if the file system is not clean because of an 
operating system crash, an interrupted boot process, an improper shutdown, or 
unplugging of a removable device without first unmounting or ejecting it. 
To fix this, simply reboot into Windows, let it fully start, log in, 
run 'chkdsk /r', then gracefully shut down and reboot back into Windows. 
After this you should be able to reboot again and resume the installation.

I cannot boot into Windows because I don't have a Windows partition. Do I have to install Windows to fix this problem? Is there a way to fix this in the (initramfs) prompt? Please help. Thank you!