Security and port 445

Hello all: After reviewing the posting here on securing my computer (win2000 via DSL) and doing the following I have a few Q's...
This is what I have done so far:
1. Installed Zone Alarm (freebie) and set as tight as possible.
2. Norton AV. Constantly updated.
3. All windows updates installed, as of a few days ago. LOL....
4. Netbios disabled.
5. Adaware run periodically.
6. Spybot search and destroy runs periodically.
7. I leave Ethereal looking (sniffing) at my NIC to the web. (While I'm away, the comp is up 24/7 do to running SETI and Folding@home. Otherwise it's off.)

As you can see I've disabled Netbios, now here's my question: I've obtained a set of instructions for securing/disabling port 445
Start Registry Editor (Regedit.exe).
Locate the following key in the registry: HKLM\System\CurrentControlSet\Services\NetBT\Parameters
In the right-hand side of the window find an option called TransportBindName.
Double click that value, and then delete the default value, thus giving it a blank value.
Close the registry editor.
Reboot your computer.
After rebooting open a command prompt and in it type
netstat -an
See that your computer no longer listens to port 445.

Being somewhat of a newbie, how will this effect my computer? :) :) Is there any other things I can do to secure my box? Thanks in advance. Yours Learnin... :D

In Windows XP & I beleave win2k also, Microsoft added the possibility to run Server Message Block (SMB) directly over TCP/IP, without the extra layer of NetBT and for that they use a TCP port# 445. I've only had problems with some P2P software and problems with chating to a couple of buddies of mine with vid/microphones over the WWW but other than that there really wasn't very many problems or anything like that.

Learnin, Have you taken a look at plug & play yet on comps like XP?

Thanks for the reply: I've never messed around within regedit. If I follow the instructions and dislike the results can I reedit and repair what I did?
Nope, I never looked at the security concerns via Plug and Play? I have heard the term plug and prey, though. :) Ideas? Links? Thanks again. Learnin...

Why do you feel the need to use regedit then fool around with the registry of these things when most of this stuff (such as netbois & plug and play) you can just disable like this: http://www.petri.co.il/disable_netbios_in_w2kxp.htm