Well here' s some programs that are very useful for computer security and are ones I use myself(except for the firewalls and antivirus programs mentioned later). All are either freeware or free versions of commercial products.
Firstly SpywareGuard, updates for the program haven't been made in years but considering it's there to alert you to BHO changes and such the update issue is not so important. It's made by the makers of SpywareBlaster. Also like SpywareBlaster is does not conflict with other antispyware programs or SpywareBlaster and it is a good idea to have both problems installed and running side by side.
To download SpywareGuard please go
here
One thing I think you did mention in your list of programs that you're already using is Spyware Blaster, are you sure this is the correct name and it is not actually SpywareBlaster? The former product is bad news and should be avoided and has no connections with the makers of SpywareBlaster whatsoever.
Next, specialised Hosts files are a great way to stop you accessing sites that are dangerous, you may not know they are dangerous but if they are and you don't have a specialised Hosts file to block access to them you can possibly become infected simply by visiting such a site. My preferred Hosts file program is MVP Hosts file. You simply download its zip file, extract it to wherever you like, I suggest a permanent folder and the run
msvp.bat, a screen will appear and you simply press Enter when prompted and you now are using its Hosts file. You can download the file and read about the program and how it works here. It gets updated every few weeks so if you choose to use it it's advisable to make a bookmark for it for easier access to check for updates. When updating the process is the same. I keep a copy of the most current zip file on computer and when downloading updates just overwrite the older file. Then I extract it's contents into a special folder I have set up just for it, I then run the program and when prompted press Enter and the program closes. Since I no longer have any use for the files I have extracted into that directory I simply delete them, with the knowledge that if needed I simply need to do the same process again since I have kept the zip file.(Sorry for all this rambling).
Next, do you have a current subscription to Symantec Corporate Edition and are you able to downloads updates for it? I used to use this very program myself but found that many free antivirus programs are just as good as usually don't use nearly as much system resources. They generally also have regular updates and come with many useful functions. Just a suggestion, I'm not asking you to change antivirus programs. However if you are interested in a free antivirus alternative, let me know and I will list some.
One thing I see missing from your list and that I feel is very important is a firewall. You're probably just using Windows Firewall but I feel this is quite an inadequate firewall(if you have Windows XP, the version included in Vista is much better). It only monitors incoming connections and not outbound ones and doesn't give you as much flexibility and features as some other 3 party firewalls that are free versions of commercial products.
These are the ones I routinely suggest, either would be better than Windows Firewall.
FREE Comodo Firewall Pro
Outpost Free Firewall
Just be sure not to install more than one firewall as having more than one running at a time may cause conflicts.
Once either of these programs has been installed Windows Firewall will automatically switch itself off
Another useful program that I just recently discovered is KeyScrambler Personal. It is designed to protect your login details from being readable by Keyloggers or people who have access to your computer remotely via a Backdoor Trojan for example. It encrypts what you type in login box fields so that the information for what you typed if sent to someone trying to steal your login details gets gibberish that they can't use to access to login to your accounts. It works for both Internet Explorer, Firefox, Flock and Netscape, the latter three have plugins to download for the program to work with those browsers but I didn't need to install one for Firefox, I think the current version includes built in support for it. It is activated when you open either browser and closes when you close either browser(however it wont close unless all supported browsers have both been closed). It can be downloaded
here. If you use either Flock or Netscape please go
here(for Flock) and
here(for Netscape) for plugin installation instructions.