I have Norton Internet Security 2004 Professional, installed on Windows 2000 Professional SP4. My firewall definitions and my virus definitions are regularly "LiveUpdated" from the Symantec website, and I run weekly virus scans of My Computer. I use Dial-up Internet connection ATTGlobal.net with an external 56K modem. I am considering if it would be useful and feasible to install SpyBot as well. Quetion 1: Is it possible that spyware runs in my system in spite of the firewall and the anti-virus? Do I need SpyBot at all? Question 2: Is there any conflict to be expected between SpyBot and NIS2004Pro? Note that NIS2004Pro Firewall Rules are no longer stored in the Registry (as it used to be in NIS2001), but still NIS2004Pro depends on the Registry; does SpyBot recognize all NIS2004Pro Registry keys and values as safe? Question 3: Can SpyBot be run only at times when my system is temporarily disconnected from the Internet and my NIS2004Pro firewall and anti-virus are temporarily disabled? This may decrease the chance of conflicts, but is SpyBot capable of detecting spyware while there is no Internet connection and the spyware is necessarily inactive? Question 4: Are there versions of SpyBot that are better suited to co-exist with NIS2004Pro firewall and anti-virus? Question 5: What specific firewall rules are necessary to enable SpyBot to operate without being intercepted by NIS2004Pro firewall? Are there any specific ports (local and/or remote), protocols or Internet addresses that have to be "permitted" to enable SpyBot to function? Please advise.