Windows hosts file and Norton (NIS 2008)

Today I noticed that when I run NIS 2008 security inspector (when going on stage to check IP adresses) it just remove all entryes in hosts file in Windows/System 32/Drivers/etc
However,when I run Spybot S&D it cretae new host file with over 8000 entries but when I run Security inspector it's just delete all entries
Is this normal?
Checking my image file created with Acronis Home (which contains ONLY Windows Vista SP1 and no other software) I noticed that also hosts file is empty too.
In both (image file and curent Windows Vista SP1) in hosts file (opened with notepad) entry is this:

# Copyright (c) 1993-2006 Microsoft Corp.
#
# This is a sample HOSTS file used by Microsoft TCP/IP for Windows.
#
# This file contains the mappings of IP addresses to host names. Each
# entry should be kept on an individual line. The IP address should
# be placed in the first column followed by the corresponding host name.
# The IP address and the host name should be separated by at least one
# space.
#
# Additionally, comments (such as these) may be inserted on individual
# lines or following the machine name denoted by a '#' symbol.
#
# For example:
#
# 102.54.94.97 rhino.acme.com # source server
# 38.25.63.10 x.acme.com # x client host

127.0.0.1 localhost
::1 localhost

Runed full system scan with NIS,Spybot and Kaspersky online scaner and nothig found

I'm very confused,what's going on (or wrong)

Vista SP1 32-bit NIS 2008 15.5

 

Hi Lazaruslong,

This is Mike from the Norton Authorized Support Team responding.

The 'SdHelper" feature of SpyBot places entries in your hosts file of malicious sites to try to filter them and stop them from infecting your computer. However, this method is also used by some malware and virus's to block and sometimes redirect you to other malicious sites. Norton Internet Security reverts the changes made to the hosts file back to normal.

Although SpyBot can be used in conjunction with Norton internet Security, to avert a possible software conflict, we recommend that you disable both the "SDHelper" and "TeaTimer" options in SpyBot.

I hope that this helps explain things better.

Thank you,
Mike