google 了一下

BackWeb is a generic, background downloading tool that software vendors can incorporate into their product to download data (e.g. product updates) to the user's PC. Its operation depends on the instructions given to it by the individual software vendor who bundles it.

懶的翻簡單說.. 是一個商業用間諜軟體.
F-Secure 裡面也是有. 你可以把他關掉
這網頁有教 how.
http://www.pestpatrol.com/pestinfo/b/backweb.asp

個人建議..
換Kaspersky 吧
我覺得比 Norton 強多了
有很多原因但最主要 Norton 每個星期四才固定更新病毒碼人家 Kaspersky 幾乎每個小時都有我就覺得強多了