What exercises could I do to lose weight but not gain (much)musclle

Light/moderate resistance exercises for each muscle group 2-3x per week, with higher reps. Tones/firms the muscles, does not enlarge them, and turns them into 24-7 calorie/fat burning machines. Muscles are the major calorie burners in our body, and keeping them active/strong is what boosts metabolism (even while you sleep) and promotes leanness.

Just run every morning for ten fifteen minutes before work

Running, swimming, various sports such as basketball or skiing.

http://www.youtube.com/user/sixpackshortcuts?feature=watch
http://www.youtube.com/user/moricestreet909?feature=watch
^^ great websites for advice on working out and toning your body. just search the videos and you'll find something your looking for.
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hope they help :)

Dan,here is something to consider.It took time to gain the weight and it will take time to lose the weight so be very patient.When you do your exercises give yourself 30 minutes and divide your time into 3 equal 10 minute segments.Side Straddle Hop-- Squat Thrust--Mountain Climber that's it for now.Enjoy and peace be with you.