any software or tool to unzip the password protected zip file?
Yes, there are freeware password recovery programs for the ZIP format. The paper "A Known Plaintext Attack on the PKZIP Stream Cipher" (http://www.cs.technion.ac.il/users/wwwb/cgi-bin/tr-get.cgi/1994/CS/CS0842.ps.gz) by Eli Biham and Paul Kocher was one of the early explanations of how to do it.
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I looked for a zip password cracker a while ago, but i could'nt find any that weren't free. They do exist but i never tried them, sorry if that's little help.