So I think I need to add "i8042.nopnp" to my boot parameters...but I don't know how.

I'm booted using the Live CD for BT4. It brings up eventually the command line saying "root@bt#". I CD to /boot/grub and I can see the menu.lst file, but how do I edit it? or am I not even near doing the right thing?

Can anybody help? I've been out looking and I can see other people have had this issue with various laptops, however I don't know how to implement the solutions they've suggested...(adding the i8042.nopnp) option.

Many thanks for your help!