The errno 5 input/output error should be possible to google. There are lots of threads dealing with it - unfortunately there could also be many reasons for it.
Since you have a working Windows I would begin with upgrading your BIOS. It's normally an easy task on a Dell.
After that you could check if it's possible to boot from USB. Push F12 early in the boot process while the USB stick is attached.
If it does not work I recommend installing a minimal Buntu from a CD. After that you install Lubuntu with
The benefit of using a minimal install is that you just have to read 15-20 MB from the CD.
sudo apt-get install lubuntu-desktop