Can't install Boot Camp. Error Message

[36Witness]

I have a Macbook (from 2007) running Tiger OS X 10.4.11
Im trying to install Boot Camp onto the computer, but Tiger did not come with Boot Camp installed. Because of this i had to download Boot Camp 1.3 Beta. This is old, and has expired, but i changed the system date to be 2006, and this has made it work.
When im partitioning the disk, this message comes up:
Back up the disk and use Disk Utility to format it as a single Mac OS Extended (Journaled) volume. Restore your information to the disk and try using Boot Camp Assistant again.
I have already Backed Up and the computer is already formatted as Mac OS Extended (Journaled), but this message still comes up. Disk Utility has Greyed out the Erase section for Macintosh HD so i cant re-format it.
Any suggestions?

 

[spinnerlys]

After you have completed a full backup, start from the grey Restore DVD 1 (that came with your MacBook) and re-install Mac OS X 10.4 via the ERASE and INSTALL option. Thus your HDD will be formatted and writes the data in a continuous space again.

 

[Baby Mac]

I also could not get Boot Camp working correctly at first. I tried some of the diagnostic/repair tools in the OS X disk manager (or whatever it's called) and it worked after that. I'd go back to my OS X side to take a look, but I am in Boot Camp and haven't bothered learning how to go back.

 

[balamw]

Disk Utility has Greyed out the Erase section for Macintosh HD so i cant re-format it.

You can't erase the partition you booted from.

Try booting from your Mac OS CD or install Mac OS to an external HDD and boot from that.

B