If You have: "auto-protect failed to load" - try this way >>>
Start regedit.exe.
Find: HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\SAVRT
Change: C:\Program Files\Symantec AntiVirus\savrt.sys
to
\??\C:\Program Files\Symantec AntiVirus\savrt.sys
Find: HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\SAVRTPEL
Change: C:\Program Files\Symantec AntiVirus\Savrtpel.sys
to
\??\C:\Program Files\Symantec AntiVirus\Savrtpel.sys