[ubuntu] GParted won't let me enlarge my Ubuntu partition

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http://ubuntuforums.org – Yes, I have searched diligently, but haven't found the answer. I have a 320 Gb HDD dedicated to my Ubuntu 11.10 installation. This HD has never had any other OS on it. At one point I was thinking about installing Windows on it too, so I went into GParted and successfully reduced the partition containing Ubuntu to around 76 Gb. It runs fine there, but it also created a second 4Gb swap (I have 4 Gb RAM), & another 43 Gb partition. I was confused, so left it alone. Now I've gotten another HDD to put the Wish-I-didn't-need-it Windows on. I'd like to expand my Ubuntu partition to use mor (Hardware)