As the prior answer didn’t really answer your question at all I’ve removed it.
If the database files have gone to 0k then you’ve got some major problems. Either your anti-virus has decided that the database files were infected with something (very possible) and it wiped out the data within the file, or there was some problem with your hard drive that caused the file to be wiped out. Based on your description I’m going with the anti-virus or some other software installed on the computer killed the files.
To get the data back you’ll need to have valid SQL Server backups. Without them the data is lost.