Firstly:

I downloaded Blood Omen from here but it won't play even with the crack - reckons that I need to insert a CD. Could I make an image of the data I downloaded and burn a playable disc like that?

Secondly:

I used to have NOX on my PC but lost it. I downloaded a back-up from another site but can't seem to install it; would Daemon Tools let me make an image somehow so I can burn a playable disc? If so, how?

Okay, that was THREE questions...

To create ISOs use UltraISO. Trial version will create ISOs up to 300MB.

Damn, that NOX still isn't working...
I've not tried Blood Omen yet.

Any tips, anyone...?

You can also create ISO's using XP Burner PRO, an Open Source CD/DVD proggy. As to you problem.. i can't look into it now (at the university). Maybe this evening!