Yes, when you upgrade from SAV to SEP, it installs in the SAV folder. Why? I have no clue and wish this were not the case.....
To do a fresh SEP install, remove SAV. Then go back check for and remove the following:
Delete following folders if present:
C:\Program Files\Symantec
C:\Program Files\Symantec AntiVirus
C:\Program Files\Common Files\Symantec Shared
C:\Documents and Settings\All Users\Application Data\Symantec
Delete following registry keys:
HKLM\Software\symantec
HKCU\Software\symantec
Then re-install SEP