Underlines disappering

Hi everyone,

today Adobe Reader wasn't working well (it was showing only a black screen when opening the document). After a while it started to work again but all the underlines i made have disappeared. I tried to get back to a Windows recovery point, but unfortunately it doesn't involve document changes.

I hope someone of you know a way to recover my work, these were about 500 pages!

Sorry for possible mistakes in my English.

Thank you in advance