Scripting

If you are not allowed to play on the servers like us, either start complaining about needing this till they create you one or go it yourself by bringing down the install they provided you for c: and extract it and modify to your hearts content.   You can use a program to open the zippped exe installer or just start the install on a machine and it decompresses its files to the temp dir of the current user.  copy the directories to your desktop before the install finishes and deletes them, or use task manager to crash the install and harvest the files from temp

You may not be able to unless SEP gives you an option to change the install location by using a switch.

http://ask-leo.com/how_do_i_install_programs_on_a_drive_other_than_c.html

http://www.itninja.com/software/symantec/endpoint-protection-manager/11-666

I'm sure the SEP installers are really just MSI installers, so changing the ROOTDRIVE property on these installs should do the trick