Reliable and unobtrusive protection system

I myself use on multiple PCs for almost 10 years throughout Norton Internet Security and am thrilled! After (CD or successful download) ease of installation, the program will only report when it is needed and warns detail and comprehensibly from danger. Otherwise enter NIS no sound and loads the system almost never because the necessary scans are performed during user inactivity.
Only 10 days before the expiry of this period (actually 366 (!) Days), it is talkative and asks (somewhat prematurely) on the extension. Carrying out the extension immediately (by purchasing an upgrade or directly from Norton) then you lose the remaining term. Therefore, one should wait just until the countdown at the end and Norton suspends work. Then you do not click on "Subscription extend" in the prompt screen but on the (lowercase) Link "I have a product key" and is a below same. Immediate installation is active again and has again 366 days rest.
In NIS program window itself is behind the remaining term whatsoever "Extend", but then not "renew subscription" in the thus opened mask on the thick switch clicking but on the link below "I want to enter a product key or code".

I consider myself therefore generally an upgrade version in stock. This easy to buy as early as the year earlier, but use them only when this is over. The license keys have no "expiration date"!
So you can wait for promotions because Norton in providing at least once Discounts up to 50% off. A 1PC-upgrade version (which can also be used without installing itself as a full version) I have already bought for 11 euros here and a 3PC version already for 20 Euro.

For NIS itself I give like 5 star, but respect for the download version, this is delivered without invoice, although the VAT is indeed quite collected, but will probably never dissipated.

Tips:
- In the browser I have the Norton toolbar disabled, I do not need, but the protective functions themselves remain active.
- It is important for users of Outlook 2010 if necessary to disable the Norton anti-spam add-in (via File -> Add-Ins -> Options) are otherwise in archive files (and only there) en masse empty folders created.
- If you have purchased a version with disk instead of a download version the immense advantage that you can start with the bootable CD to computer and get rid of pests, if they prevent the computer start completely and make it unusable.