DBF corrupted database

Hey friends, I’m in great trouble here.

I’m using Microsoft Visual FoxPro 9.0 on my Windows 7 machine. I had some DBF files which was created in MS Visual FoxPro. The files were undoubtedly valuable since they contained my crucial data related to my office work. The files are now invalid therefore, inaccessible. I can’t access any of my database files. Whenever I try to open one of them this comes in front of me: “File filename.dbf does not exist”.
According to me this must be a file corruption error states the file is corrupted. I don’t know how did it get corrupted. I’m dying to get these files back. Please help in this.

Thanks in advance.