I don't think UTStarcom people knows difference between driver and PDFs files. I didn't see option for UT300R2U driver download for windows xp 64 bit version in any corner of their support page. If some one has it from somewhere else please share with us.
By the way, jagan can find 32 bit version driver here:
http://rs6.rapidshare.com/files/46287730/UT300R2U.rar
Thanks.