Is their anyway tht i can look at my old msn IMs tht i had wit a friend?

my friends and i r suppose to be going to the movies tonigh,and my bff gave me another friends number over the IM so i cn call her and ask her wht time exct exct,but then after he gave it to me he logged off and my computer restarted itself >< so now i dont hv her number.....and i dont hv anyoneelses numbers,so is their anyway PLZ AND TY!