... Virus? Blue screen of death? Artistic existentialist crisis?
In all seriousness, I've had quite a few of those. Is awful not being able to backup all the important stuff. Ever since, I upload the most critical files to a google drive or dropbox.
Hang in there, I got my laptop stolen this past summer and had to indebt myself with a new one.
Anyways, keep a good free/pay antivirus, get malwarebytes for scanner, upload files to yer mail and do "restore points" every week. Also erase cookies.