Cod4 help pc

Hello,


I was playing COD4 multiplayer on my pc. During one of the matches it crashed and gave me the "Ended unexpectedly, safe mode" thing. I clicked safe mode and went to join server. My friend was gonna tell me this ip to join but that button thats above tab wasn't bringing anything up. He then told me to go to add new favorite but it wasn't letting me click it.

Any help?