ok you wanna google the file and find out what folder it actually goes in. if its a windows file itll be somewhere in c:\windows\
then you want to take out your harddrive from your pc and on the end where the cables go into it you will have a small recess with some pins in and probably a jumper. you want to move this jumper (take it out with a small screwdriver or try grab it with your nails) and put it over the S (slave).
if it aint got a jumper in, i *think* it may work if you just plug it into your friends pc and hope it picks it up automatcically via cable select. just hope it dont try boot from yours first which it shouldnt if yours is going into the secondary.
do you know if your harddrive is IDE or SATA? you wanna take your cables from the harddrive with you to your friends pc just incase it hasnt got the cables already in there for a secondary. also if your harddrive is sata, make sure your friends motherboard is sata compatabie or it wont work.
then just plug it in, boot it up, get that file downloaded to your friends pc, copy it over onto your harddrive and in the windows folder which should come up in my computer.
pretty sure this is the only way to do it if your hd aint booting at all