Can U decode an FSK modulated signal and find out the text inside it using Proteus simulator ?

The frequency spectrum of noise is wide band as it has "all" frequency components.I have no diea how you can decode the noiseless file, but I guess if you can filter off a major part of the noise, the noisy one will be more "decodable". A frequency analysis will indicate the spectrum of the FSK, and one can then identify a suitable bandpass filter which will remove much of the noise.