.... offers a free trial. I've only ever used Powerquest's version, but if Paragon is similar it's fairly straight forward. BUT, you will have to lose/empty the partition that doesn't hold the operating system.
DMS05 - the problem with partitions of relatively small sizes is that because the free space is distributed across two drives the amount of space available for defragging each drive can be insufficient. A total of 5 gig maybe enough to defrag, but when it's split into 2 x 2.5 it's too small.
Acronis Partition Manager, as mentioned above, is available on the cover of another mag (saw it in the local s/market this morning. Bear in mind that this will not be the latest version, but it will do what you want.