Driver's tally came on a left-footed blast from outside the box after collecting a cross from Giles Barnes.
Tally Hall made two saves for Houston (5-2-2), which climbed into a four-way tie atop the Eastern Conference with 17 points, sharing first place with New York, Sporting Kansas City and Montreal.
The Galaxy, tied for second in the West, fell to 4-3-2.
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