Check also the 32bit key:
HKEY_LOCAL_MACHINE\SOFTWARE\Classes\Wow6432Node\CLSID{B54F3741-5B07-11cf-A4B0-00AA004A55E8}

To make it clear: the keys
HKEY_LOCAL_MACHINE\SOFTWARE\Classes\CLSID{B54F3741-5B07-11cf-A4B0-00AA004A55E8}
HKEY_LOCAL_MACHINE\SOFTWARE\Classes\Wow6432Node\CLSID{B54F3741-5B07-11cf-A4B0-00AA004A55E8}
MUST exist. They should contain InprocServer32 subkey with default value C:\Windows\system32\vbscript.dll (or C:\Windows\SysWOW64\vbscript.dll)

while corresponding keys in HKEY_CURRENT_USER MUST NOT exist.