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I don't want to install to the C: drive

Install steam on the harddisc where you want the game. Insert your serial and just download the game. Or if you internet is slow try the following install the game on some other computer. Then use the inbuilt steam backup function of the game. (or just go to steam\steamapps\ and copy and paste the *.gcf files on some disc and then move them to your harddisc in thesame folder of steam on the comp where you want the game to install.
 
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