burning NRG (Blood Omen2)

[DemonBln]

Hello

How can i burn an nrg file with nero.the problem is that i have an nrg/image file from Blood Omen 2.when i select burn image mode 1 everything unchecked it says not enough space on the disc.the file is 756 KB and on the disc 700 MB so i took a disc with 800 MB and nero says again not enough space ...so what's now the problem and how can i burn this damned nrg/image?

Please HELP!!