Vikram is right... Any product hardcoded to install on primary partition will always refer to <root> and thats how it should be designed... I guess SEP works the same way... Because normally, citrix servers have some other alphabet assigned to OS drive.... and I don't remember creating an install setting... :) .. Though you create a install setting to load SEP on a different drive, LU will always sit on the root drive...
Cheers,
Visu.