C: D: and E: == Windows/DOS, and it is in use for some time, hence needing cleaning - "taking the bottom off" indicates a Laptop running XP or Vista?
As long as the C: drive is the active primary boot partition, it may be that the other Drives are a Data partition and a manufacturer's recovery partition, but I am still guessing.
XP and later versions of Windows have a rudimentary graphical partition editor (based on Partition Magic code from about 1990), in the disk management console (right-click on (My)Computer, and find the disk manager under storage. This is capable of shrinking deleting merging, creating and expanding partitions, and changing disk formats.
As well as PM mentioned by Roger, EASEUS Partition Master is a freeware utility capable of similar tasks, but with greater ease and confidence than the windows built in version.
There is also a powerful Windows command-line utility called Diskpart, accessed by start, run, cmd, diskpart, which then opens in it's own console. Diskpart /? shows a list of command-line arguments, and usage help.