Can't boot from Live CD to fix Grub problem

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http://askubuntu.com – I have a dual boot of Win7 and Ubuntu on my HP laptop. I upgraded from Ubuntu 11.10 to 12.04 today and on restart I got a different black Grub screen instead of the usual purple one. (GNU GRUB version 1.99-21ubuntu3.1) Each boot option only returns error messages. error: no such partition. I read on some other posts that I should make a live CD and boot there to use the boot repair tool but my laptop wont boot from the disk. I have changed the BIOS setting so that boot from disk is first and also tried telling it to boot from CD in the Startup Menu. Each time I restart however the CD d (HowTos)