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.

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?