"Gnome Partition Editor" is a Linux program, meaning that you will either have to install Linux, or run it from a bootable "Live Linux" CD. That also means dealing with the quirks inherent in Linux.
It is very important to read the instructions - there are a few quirks in Gnome PartEdit. For example, while it can resize NTFS partitions, you MUST reboot Windows, and Windows will note the changes and scan for errors and correct them.
It is not as easy to use as Partition Magic or Partition Commander, 2 programs I can recommend for ease of use. Both can resize/move FAT, FAT32, NTFS and Linux partitions without any problems.
If you want to save money, try the disk management tools included in your OS first. Then, if they are insufficient or too difficult, consider other options.