DON'T BUY THIS UNLESS YOU WANT TO WASTE SEVERAL HOURS AND END UP REBUILDING YOUR PC (I HAD TO RE_FORMAT MY HARD DISK AND RE_INSTALL WINDOWS). AFTER RUNNING THEIR "OPTIMISATION" EXPLORER TOOK 60 SECONDS TO RESPOND TO ANYTHING - OPENING A FOLDER, RIGHT CLICKING ON A FILE, ANYTHING. I UPGRADED AND THEY WON'T GIVE A REFUND BECAUSE THEY OFFER FREE TRIALS. WASTE OF TIME AND MONEY - DON'T BUY IT !!!