Windows 7 Disk Defragmenter reorganizes fragmented data so that the performance of your disks and drives is not affected and it can work more resourcefully.
Technicians at HP help-desk can use either the Windows-based PC repair tools or some third-party applications to diagnose and fix problem. They can analyze the Windows Event Viewer and the registry settings to know the fault with the machine, and can follow the right method to tackle the situation. A few easy-to-access tools are Action Center, Windows 7 System Recovery Options, Disk Clean up and Disk Defragmenter