In the deployment task used to install VSE, you can specify additional command line parameters. (Underneath the dropbox for selecting the product to install, there's a text box called Command Line.) You can specify a different install path here by using the INSTALLDIR switch, for example INSTALLDIR="D:\VirusScan"
i spent ages looking for a way around it.
I have created a new tag for the few servers i want the D:\ installation to occur on.
then created the client task with the following command line
SetupVSE.exe INSTALLDIR="D:\McAfee" ADDLOCAL=ALL /q /lev "c:\log"
all to no avail. machines not tagged with the group for this install, install on C:\ without a problem?
I think that the installation designer can do that also