ubuntu usb installation windows 7 : kernel panic

[pal3]

When trying to install ubuntu using usb on winows 7 machine. I am getting this
kernel panic unknown-block(2 0)

Attaching the screen capture for details. Kindly have a look.

Can someone please suggest what can be the reason. I am new to Ubuntu

[yancek]

Did you do an md5 checksum on the Ubuntu iso after downloading it?
What software or method did you usee to put Ubuntu on the flash drive?
Do you have another computer available to try booting it on to see if the usb works and eliminate that as a possible problem?