Installing Redhat Linux

[robinwilson16]

I wanted to try Redhat Linux again so I downloaded it, but when I boot the cd it comes up with the linux screen saying press enter to install so I press enter and it loads a lot of stuff but then it stops and says

Code:

RAMDISK: Compressed image found at block 0
Crc error<6>Freeing initrd memory 2640k freed
VFS: Cannot open root device "" or 48:05
Please append a correct "root=" boot option
Kernel panic: VFS: Unable to mount root fs on 48:05

and the capslock and scroll lock lights flash

I have tried downloading the iso 4 times now from 4 different locations but get the same message every time and even tried installing on a different machine and got the same message.

I searched for similar errors and tried various switches but still always get the same message

Mandrake installs properly

Any ideas please

Thanks