"...did not set Explorer to be the primary browser. Could this be the reason I cannot use a link to AP e-mail?"
Yes, you need to set IE as your default.You could reinstall FF and set it as the default.
You set the default in the Control Panel --> Internet Options applet (Classic view or Network and Internet Connections in the Category view).
As to which browser is faster, all the variations will have their proponents. It seems to me it depends a bit on the types of sites you visit. I use Internet Explorer, but I have tried several of the alternatives including Netscape and Fire Fox. I settled on Internet Explorer because I know this software the best, so it is the fastest for me.
Is FF faster than IE?Generally there is no reason a computer can't run both versions. You use the one you like, your daughter using the one she prefers. However, an agreement will need to be made about the program defaults (which are set in Internet Options in the Control Panel).
But in the long run, it might be easiest for you two if each of you has your own separate login. That way changes she makes within her login won't affect your preferences within your login.
Add an additional login for you daughter in the Control Panel/User Accounts (Category View) or User Accounts (Classic View).
As for Toolbars, I recommend that you uninstall any "third party" toolbars, including the Netscape toolbar. They have a tendency to slow down the system and they don't do anything for you that you can't do yourself manually. But again, that is a personal preference and if you really like it, then use it as you see fit. If problems develops, you can uninstall it, then reinstall it to try to fix it.
I cannot emphasize enough the need to run effective Spyware protection. You can download three very good one free from my site at:
http://dwightblackburn.com#spywareI would recommend "SpywareBlaster" as the most important of these because it is preventative, but the other two (Ad-Aware and Spybots) are important as removal tools.
The "Hijack This" is very good also, but it does require a much higher level of expertize.