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First of all, if you are a very busy user, or one who just doesn't want to spend a lot of time learning the software, you can employ the
Scan Now function, right below the program icon, on the left side of the main screen (see image on the left). Basically this does a relatively quick overhaul of your system, focusing on the most vital aspects that need to be checked and repaired. You still have some control over what the program changes and what not, so it's not 100% automated. It is recommended that you use this option if you have read the quick start guide first, in the program's help section.
Another thing that you might want to use in this piece of software is the Registry Cleaner. This can be found in the Optimize menu (first option in the menu on the left). What this does is check the Windows registry for inconsistencies that it will repair afterwards. The process is not fool-proof and as the system gathers clutter over time, you need to do this regularly, to ensure good performance on your PC. There are specialized programs that do just that, but this one is good too.
The Optimize Your System option is an interesting function of the Norton Utilities. It takes longer than a fast check-up mentioned earlier, as it requires your input too, but it can improve your system's performance more. Through this option you can do a one-by-one check on the running processes of your system (and eliminate the ones you find unnecessary), perform some pre-set tweaks to improve performance in general, or check some statistics of your systems. You can find this function in the same menu as the Registry Cleaner. Again, there are specialized program that undertake this task, but if you want to keep things simple, this program is a good alternative.
The Clean Your Disks and Defragment Your Disks are two more optimization functions that are equally useful. As you use your computer, your hard disk drives accumulate a lot of clutter (useless files), plus all the stuff written on them become a bit messy (fragmented). This makes your computer run slower and sometimes can create problems in the system's normal function. These two functions (which should be performed in this order for best results) take care of that.