>My kids have installed some beta mail client; it has expired, I uninstalled it, and now I don't have a default mail client. If there's a mailto link, each browser thinks it should use its own email client - IE looks for OutLook, NS uses its own mailer.
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>Each mailer seemed to register itself somewhere at the system level (but Netscape failed to do so when it installed); what I need is a way to do it manually. Is there a way?

I seem to recall, in Outlook at least there's an option buried deep somewhere telling it to "check if Outlook is the default mail client at startup". By default this is on. I think OE does this by default, as well. So, unless you've changed these settings you should just need to manually start up your mail client (by itself, not through IE).