At each startup, Windows defragmenting the files that are used to start the system. The intention is commendable, since they are defragmented, these files are read more quickly. However, as Windows practice this on every boot, it will eventually be penalized. The ideal is to disable the defrag even if the reactivation of time to another.
1. Make a backup of the registry through the System Restore tool (Create a restore point)
2. Run Regedit. Open subsection HKEY_LOCAL_MACHINE \ SOFTWARE \ Microsoft \ Dfrg \ BootOptimizeFunction.
3. Locate the Enable key and double-click it in order to make it jour.Indiquez N in the case of the data value.
4. Close Regedit and restart Windows.