i once tried connecting my k300i with PC, and after failing for abt 2 hrs i gave up. its almost impossible to join via infrared. instead get a data cable.
or this is what i did.
or if u have GPRS then try this
go to
www.zedge.net
create and account and there u can upload the file that u want
then open wap.zedge.net on ur handset enter ur user id and password and go to downloads section. then u can download the file.