backed up my myst v dvd, how to play it?

[stkh]

hi guys, i have backed up my dvd for myst v, (used nero).

as i see on here it is a prob for many to get it to run cos of the securom 7 protection.

i have downloaded things mentioned here like gamejackel, daemon tools and antiblax, but how the hell do i use them to get me backed up game to run????
also what is meant by an 'iso' immage? is that the temp file the system places on the h drive prior to burning?

my system is a p4, with win xp pro.

i ran the disks (origional and copy) through filecompare and it shows the copy to be exactly the same.

many thanks for any help