You have uninstalled GSS 3.0 and now are reinstalling to the same system. After installing GSS 3.0 you attempt to apply the latest hotfix. When the hotfix installer is ran you receive a dialog prompting a repair instead of the usual install dialog.
The product installer key in the registry left behind from the previous install of the hotfix has the Windows Installer believe the hotfix is already(still) installed.
Deleting the appropriate registry key then running the hotfix installer will allow for a normal install. See the below registry keys and their corresponding hotfix(HF).
HF3 - HKEY_CLASSES_ROOT\Installer\Products\92BEDBA7ABC30CC44A3B580843BD5CF9
HF4 - HKEY_LOCAL_MACHINE\SOFTWARE\Classes\Installer\Products\243C1AB6F71E42249B288E6BD7CDCA91
HF5 - HKEY_LOCAL_MACHINE\SOFTWARE\Classes\Installer\Products\2EA2F29838C8CB944BF3DED50A82B317
Additionally, you can search HKEY_LOCAL_MACHINE\SOFTWARE\Classes\Installer\Products\ for the string 'Symantec Ghost Solution Suite 3.0' to find any of the HF product codes.