Campaign progress lost

I recently wanted to replay Warcraft III again, but my entire player profile just... vanished when I opened the game the next day.

A few months later I tried again, and played longer before closing the game, but when I got to the mission after Jaina left I couldn't find her items in my base, Arthas' item were gone too.

Does anyone have an idea whats going on here? I play the original disc version.