Activating XP Mode: If you've outdated but nonetheless, important software apps which no longer work in Windows-7, then you could experiment with applying XP Mode, a virtual copy of XP that works in a window in your Windows7 desktop. But there's a big potential problem, as XP Mode only operates with systems that contain hardware virtualisation (AMD-V or Intel VT) built in and also switched on. If you have a compatible Central Processing Unit then this might just be a point of allowing the option within your BIOS set up program, even so many high profile brand names, among them Sony Vaio, disable this setting over "security reasons", and this obstructs XP Mode from operating.

Excel's AutoSum tool can be used to automatically generate formulas. You will find it in two locations on the ribbon: in the Editing section of the Home Tab; and, also in the Function Library section of the Formulas Tab.