Goals from teenage striker Angelo Balanta and Akos Buzsaky earned QPR a deserved victory and kept Nottingham Forest bottom of the Championship.
Balanta struck just after half-time, prodding home after Damien Delaney flicked on Fitz Hall's long throw.
On the hour-mark Buzsaky fired a 20-yard strike into the top corner to double the hosts' advantage.
Nathan Tyson and Luke Chambers went close for Forest before Lewis McGugan scored with a fine free-kick late on.
QPR assistant boss Tim Flowers:
"It was important after the run of games we've had that we got our noses in front, which we did. Their goal rocked us back a bit but it was a good result and a good three points.
"The first goal was vital and, fortunately, we got it today.
"We then hunted the ball better in the second half and we've got pace at the back, so there was no need to worry and sit deep. It was about being brave."
Nottingham Forest manager Colin Calderwood:
"We will get through this stage and will be better for it. We'll end up stronger.
"We've got good players and they are better than their position in the league suggests at the moment.
"In the end it was a fair result because we didn't defend well from two throw-ins, and that gave QPR a start in the game.
"When you're without a win and bottom of the table, that's a lift you cannot afford to give the opposition."
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