How often should I defragment my laptop or desktop? By YL ComputingSpeed Up PC Most experts recommend defragmenting your hard drive once a month. However, if you are an “advanced user” who is constantly copying and moving large files, it is better to defrag your drive more often. Related Content:How can I optimize Windows to run faster?Are there any software programs that can increase the speed of my PC?Are there any common mistakes that can slow down my computer significantly?