Assisance with Win98

I am basically computer incompetent. With that said, my family members are worse, and after reciving an infected e-mail our computer has been swamped with "fecal matter". I've installed and run Ad-aware, SpyBot S&D, and I reguarly use Notron AV/Firewall, but to no avail. After cleaning out my computer (and after 4+ hours on the phone with microsoft tech support), Mostly everything is fixed (or theres programs that are hidden and I cant find). Mostly. there is a toolbar that got installed (The "Begin2Search.com" toolbar) and it just won't die. I have no idea what a Hijack this log is, haven't run(?, is used a better word?) one, but this toolbar runs as a component program, so its not shown an the add/remove programs list. It doesn't even show in the running processes list. For that matter, I've searched that IE folder and cant find it. I'm basically a babe in the woods and could use some help.
Now, when, with your help, I finally get deleted, is there any way to make certain that all of that malware/spyware/adware/trojan horses and what-not are actually gone and not just residing in some hidden file?
I realize that this type of problem has come up on Delphi before, but I've checked and it does not apply to this (I've already used all the suggested AV programs without any sucess). You might be able to ID this problem by a file named "o". It is a .bat file and runs a MS-DOS screen that searches for a non-existant file, then overruns the search buffer (As I understand) and writes 19 different adware/spyware programs to your computer. Any help at all is appreciated, and if you need more info, please say so.
Thank you all very much.

Michael Greenley, Team 341