Making a partition for a dual boot

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Hello mint users
I'm ver happy with linux but my only problem is that I can't get cubase to run on it.
And some software that I need for school. So now I'm trying to dualboot it with windows xp. If I'm not mistaking I should start by makeing a new partition but fdisk says that there are no free sectors available. And I can't make a new partition with GParted either. So if anybody knows what I need to do tell me please.
Thanks in advance
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[TheDynamicHamza21]

Since you,I'm assuming, used the whole disk for Linux Mint you shouldn't have any free space so what you need to do is resize that partition and create a new partition with the free space. However I would install XP first then install Linux Mint. That's is the best option since sometimes when Linux will not boot when Windows is installed after Linux:
http://askubuntu.com/questions/111174/u ... ng-windows

So backup your data and follow these tutorials to install XP first then reinstall Linux Mint.
http://www.linuxbsdos.com/2012/06/06/ho ... windows-7/
http://lifehacker.com/5403100/dual+boot ... ct-harmony

The only thing unless you plan on ungrading your OS everytime LM releases a new version I wouldn't create a boot,swap,home, / partition just choose "Install along Windows" when installing Linux Mint.