Try Adobe Audition or if you could find CoolEdit 2000. Cool Edit is old software which was laster purhcased by Adobe. They then released it with the name of Adobe Audition.

hi thanks u all friend for ur kind replies and i also search a great software havent used it myself but i will. and i think it can edit the audio files here's its some feature and qualities. hope u ppl will like that.

here's the page where u can download it

http://www.nch.com.au/wavepad/index.html