Double-click My Computer, right-click local disk C, go to Properties at the bottom, go to Tools (second from left, and there is error checking at the top and defrag below it.
Or I use Auslogics defrag for both my xp and vista pc's click here
WPA2 hack: How secure is your Wi-Fi?
Add Depth Of Field to a photo using Tilt Shift Blur in Photoshop
iPhone tips & tricks
Les meilleures tablettes 2017