Hello, I'm new here. I'm using a Dell Inspiron 1420, upgraded to Windows 7 Ultimate 32 bit SP1 from Vista Basic 32 bit SP2. RAM: 4GB DDR2, Processor: Intel Core 2 Duo T5800 2.00 GHz. Today when I logged on, my laptop suddenly lag. So I decided to start Task Manager and I saw the CPU usage was at 100% and surprisingly i left my laptop on idle and it still shows the CPU usage on 100% I heard ComboFix could solve this problem, can anyone guide me on this? Thanks.