First you need:
1)LBA(doesnt have to be original game)
2)DOSbox(search Google)
3)No-CD crack(if you cant find ask me)
Install the game to a C:\ directory(like C:\LBA)
Open and type in DOSbox
mount C C:/LBA
then just type C: (then you should have a C instead of Z)
(if you have the game launching file in another folder in LBA folder)type cd foldername(like cd LBAgame)[cd=change directory]
then type the file that opens LBA(some have setup.exe and some LBA.exe)[if you have a crack then it should be Relent.exe)
If your game doesnt start, then in install or setup choose no sound and no speech.
Your game could be running slow in DOSbox so you need to find your best frameskip and cpu cycles.
ctrl+F12 increase cpu cycles (11000 worked best for me)
ctrl+F8 increase frameskip (10 was best for me)
If you have any questions dont hesitate to ask.