It's not really clear from your post what "stopped working" exactly means.
But - unless you feel you're married with WLM - I'd simply download another email program like Thunderbird (that's free) and use that.
I have been using Windows Live Mail but it has stopped working.
I have tried to remove it from add & remove in control panel, seem to remove it, but after reinstall it appeared but was locked & could only remove it using Task Manager tried a commercial Uninstaller & re-installed, same problem. I have even gone into the Register & removed all traces I could find, meesenger, sync, essentials etc & re-installed but no change.
How can I get it to work again I am using Xp