I am currently in the process of installing Fedora to dualboot with Windows 7 on my computer. Before I began the process of installing Fedora, I took 20 gigabytes of space off of one of my partitions to put Fedora in. This space showed up in the drive menu during installation as 20481 MB of free space. When, however, I tried to create a partition with this space, I got an error message saying that there is not enough space to create the partition. Help?