I don't want to lose any data or else i would installed them again. There must be a way to increase the partition size.
You should use Gparted, a great disk partitioning software.
Download it from here
Another alternative you have is to boot from an Ubuntu live cd/usb and use Gparted from it.
Note - Although the download link says
That is not much encountered. As long as you are resizing onto an empty unallocated space you are safe.