Just made a quick script by altering ur code. Try it
navigate("https://signup.live.com/?wa=wsignin1.0&rpsnv=12&ct=1464707682&rver=6.4.6456.0&wp=MBI_SSL_SHARED&wreply=https:%2F%2Fmail.live.com%2Fdefault.aspx%3Frru%3Dinbox&id=64855&cbcxt=mai&bk=1464707682&uiflavor=web&uaid=f2ac4039dc614d15bbcabe4b9c59c5a7&mkt=EN-US&lc=1033&lic=1","Wait")
wait for browser event("Page Loaded","")
reset account("Any")
wait(1)
set(#FirstName,$account data("First Name"),"Global")
set(#LastName,$account data("Last Name"),"Global")
set(#UserName,"{$account data("User