Try this:
SELECT ProductID,ProductImage
FROM Computers_F3
WHERE ProductID=(SELECT ProductID
FROM Advice
ORDER BY Score DESC
LIMIT 1)
OR using JOIN
:
SELECT T1.ProductID,T1.ProductImage
FROM Computers_F3 T1 JOIN
Advice T2 ON T2.ProductID=T1.ProductID
ORDER BY T2.Score DESC
LIMIT 1