combining iso files

Hello ppl.
i have a question that is of dire importance.I download a program onto my computer and it came in parts.
The parts are all .iso files.Anyway, i was wondering what i am supposed to do wit these files.
I know that i am supposed to mount them but when i open up daemon tools lite, and i add the device (part 1), it comes up as unmountable.So, what i was wondering was, what am i supposed to do with these?
I think i need to combine all of the .iso files but i do not know how to exactly.So, can anyone help me with this?

What are the full file names.They may be split archives, in which case you just need to extract the first one and it will combine them all.

ok. each one of the iso files are in a winrar file. There are 6 winrar files with each holding one.lets say that my program is called romcomso, the parts would looked like this when i extract them outromcom.iso -->
romcom.iso <-->
romcom.iso <-->
romcom.iso <-->
romcom.iso <-->
romcom.iso <--yeah. and when i try to mount the first one, it doesnt let me.

that is all one file split across multiple archives.

ok....what does that mean?and what am i supposed to do from there?

Replying to #5

Extract using winrar.If they have the same winrar name, extract any and they will join to make 1 iso file.If there is a number one, I'd extract that.(I would advise telling us the rar file names rather than the iso's-that is what's inside and what you need).To use the iso once done, you need a virtual driver program (it's like an emulator but for ccd/dvd data).Alchol 52% does fine and is free, also once you got it just right click and "mount" and you can run it like a normal cd.