there may have been an error during install. before you reinstall use disk clean up in system tools to delete temp files. use a dvd drive cleaner to clean lens. disconnect from internet and temp disable av while you reinstall.
WPA2 hack: How secure is your Wi-Fi?
Add Depth Of Field to a photo using Tilt Shift Blur in Photoshop
iPhone tips & tricks
Comment afficher des fichiers cachés sur Mac ?