Step 6: If you don't see any changes within the Power menu after the reboot, simply use the Update and Restart option to reboot your PC again. Your PC should now boot with no unwanted services or startup items, hence the term 'clean boot.' On the pop-up box that shows up, click Restart to reboot your PC. Step 5: Click Apply, and then click OK to exit the System Configuration dialog box. If you already had certain programs disabled, simply leave them as they are. Step 4: Select and disable all startup items. Step 3: Click the Startup tab, and then click Open Task Manager. Important: Checking the box next to Hide All Microsoft Services ensures that you don't disable any vital system services, so make it an absolute point that you do that.