Resizing partitioned windows7/ubuntu12.04

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http://askubuntu.com – I have a windows7 600GB HD that I partitioned to 350GB for windows7 and 250GB for ubuntu, but after some times I started getting messages that my HD is running out of space whenever I used the ubuntu os. Then I realized the ubuntu os is installed in a space of 17GB which I don't know how it came about. My question is how to resize the the 17GB so that I can have the ubuntu os in the 250GB. I am new in ubuntu and need help desperately cos I don't wanna loose my work there.... (HowTos)