I bought the expansion on-line from the WoW webpage and downloaded its installer and when i try to use it it displays the error that i dont have enough space in my harddrive/

In the windows harddrive i have 4 gigs free, and on a second harddrive where wow is i have 150 gigs free.

The installer wants to save the temporal files in "users\public\documents" rather than letting me choose where i want to save the file, So anyone know if there is a way to change this?
I am having the exact same problem. My "C" drive is a dummy partition that has only my bootloader and pagefiles and is only 688mb free. I want to install WoW onto my drive "D" which has 60,2GB free, but there is no option to install it there nor does it work when I place the installer into the directory I want it to be in.
Just installed windows temporally on the big harddrive just to download the expansion and it seems to be working... saddly i coulnt find a way to change the temporaly folder..
Im using windows vista though.

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