installation problems with streaming api for xml

hi
i downloaded the streaming api for xml .but when i tried  to unzip it 
gave  errors.
inflating: jsr173_1.0.pdf
 inflating: BEA.EUSLA.v5.doc
 inflating: BEA.RI.LIC.FINAL.doc
 error:  invalid compressed data to inflate
file #4:  bad zipfile offset (local header sig):  177431
 (attempting to re-compensate)
file #4:  bad zipfile offset (local header sig):  177431
file #5:  bad zipfile offset (local header sig):  183699
file #6:  bad zipfile offset (local header sig):  204142
file #7:  bad zipfile offset (local header sig):  242080
has anyone used this ? or tried their hands on this .what are your 
experience with it?

thanks
jay