Defraggler is a popular disk defragmentation software developed by Piriform, the same creators of CCleaner. It is designed to optimize your computer's hard drive by rearranging fragmented files and data, thereby improving disk performance, reducing fragmentation, and increasing overall system speed.
This forces you to either reinstall the cracked version (downloading more malware) or use a degraded trial version that may have broken scheduling features. defraggler professional key