In my opinion, there is no such thing as 'too much' protection. If you have the system specifications to support a whole list of such software, then by all means, go ahead and download whatever programs you feel you require. Do not however, by any means, have two or more anti-virus programs and/or firewalls running on one single PC, as that can cause some serious conflicts for your system.
The list of software you listed seems to be pretty decent. Here's a list of the programs I currently have on my own system -
Norton AntiVirus 2005
Microsoft AntiSpyware Beta1
Ad-Aware SE Personal
WinASO Registry Optimizer
Deer Park Alpha 2
As you can see, the programs I have on my PC make for a pretty hefty list, too. Even so, I don't necessary take the security of my computer for granted - new, undiscovered viruses/malware can easy overtake a PC at any given time in between those definition updates, and it is for that sole single reason that I have WinPatrol installed on my computer, for around-the-clock protection.
Mozilla Thunderbird isn't required for your Mozilla Firefox to work, as it is a standalone e-mail client application by itself. What it does is pretty basic - you set up your existing e-mail account on it, and it simply retrieves and delivers your e-mail from your inbox straight onto your desktop whenever you open up the program. It does not create a brand new e-mail account for you, so you won't have to worry about giving up your Yahoo account - you simply use the software for convenience, so that you won't have to visit Hotmail or Yahoo or Gmail and log in manually every single time you want to check your e-mail. Another thing to note is that it only downloads legitimate mail from your inbox - all those few dozen junk e-mails that get dumped to your address daily are kept where they are - in your spam folder, and out of your sight.
Most of the people who require an e-mail client are those who have multiple e-mail accounts, and have to handle loads of e-mail everyday. For me, I use Thunderbird simply because I adore the way it makes the chore of having to check my e-mail every single day so simple and efficient. There are many reasons why I prefer using Thunderbird over regular old webmail, but if I had to list them all out it would probably take me until next morning or something, so you'll just have to gauge for yourself whether you feel you truly require an e-mail client or not. Setting up an account can be pretty tricky for the first time, but what I did when I first started up was to visit the Thunderbird support forums, which provide extremely detailed instructions on how to set up different e-mail accounts on TB.
when I run all the above listed cleanups, I wind up missing a file or files my HP6210 needs & have to insert the CD because I still get a 'trapApp' error. Any idea what I am doing wrong?
What do you mean when you say 'run all of the above'? Do you run them one by one, or all together at one go? Which program scan triggers off the error messages? Do you happen to have a screenshoot of the error message that you can show us? If no, can you provide more details - like, what do the messages say, exactly? How many different ones do you get? What file or files do they claim you are lacking?
Sorry for that bombarding of questions - just try to answer them best as you can, please, so that we will have more material to work with when trying to assist you.