Sassa is right,
Leave the triangle as it is, if you don't have any problems.
Sometimes people are allergic to yellow triangles and end up ruining their sytem trying all kinds of drivers
I have 2 yellow triangles, but all my hardware that was in XP and Vista, is there in Windows 7, so I don't care about the triangles.
The two graphics drivers is indeed right.
Some drivers oem's prefer to show both VGA and DVI as separate drivers.
Others prefer to show it as one.