I was able to fix this on my own. Turns out one of the files was corrupted which I found out after I was finally able to get it to try and boot from a USB device.  I found another Window's Vista installation disc that I had received with another laptop and used that. Worked fine.
Hi, I recently installed a new hard drive in my laptop because the old hard drive was dead. So, I installed the hard drive and I am now trying to install the operating system using the Dell disc that I received with my laptop. It's for Window's Vista 32 bit and it says it is to be used for re-installation of Vista. It was in a sealed envelope - so it's never been used. When I boot the laptop and insert the disc it just says: Operating System Not Found.  I have made sure the cd drive is first in the boot list.  I have also put the disc into another laptop and copied the files to a USB drive.  Then tried installing it off the usb drive. No luck.   I have run system diagnostics and it says my hard drive and cd drive are both recognized and functioning. Is the dell cd disk not bootable?  Thank you in advance for your help.
Installed New Hard Drive - Now "Operating System Not Found"