Try like this
With NOT EXISTS
SELECT Name
FROM dbo.vComputer AS V
WHERE NOT EXISTS
(
SELECT Name
FROM dbo.vComputer AS S
WHERE S.installedsoftware LIKE N'%word%'
)
WITH NOT IN
SELECT Name
FROM dbo.vComputer AS V
WHERE Name NOT In
(SELECT Name
FROM dbo.vComputer AS S
WHERE S.installedsoftware LIKE N'%word%'
);