It seems your laptop may be trying to boot from the wrong device. As you are trying to install an OS I guess you have a cd (or dvd) in the optical device so enter Bios and change the boot sequence to boot from the optical device.
Here is a discussion on the error, I don't recommend whacking the laptop, this extraction seems a better approach
From: Dominic on 10/28/2009
if you have the PXE-E61: Media test failure, check cable problem just go into your bios and change the boot device from booting from network it's all i did and it works.
Good luck