Automatic disk defragmenter that features scheduling and a high level of configuration.

Licence Type: Shareware $49.50

Operating Systems Support: Win XP/2K

Download Link: Diskeeper Professional Edition

Developers Homepage: Executive Software

Diskeeper is an automatic disk defragmenter that features scheduling and a high level of configuration ability, and can defragment even critical system files. Fragmentation occurs during normal Windows operation, as files are broken up in pieces and saved on different parts of the hard disk. This increases the amount of time it takes to access single files, and bogs down system performance.

Limitations: 15-day trial. Will not install on Windows 2003 server. Standard and Enterprise versions are available for download from the authors page for Windows 2003.