File Contents Missing

This is strange, I have 6 XP stations in a workgroup setup. 1 Pro and the rest XP Home edition, 2 wired (XP Pro,and one XP Home Station), the rest on wireless. The XP Pro box is where all data is access by all stations. My access database file at different times is missing data (Contents seem to have disappeared)but the file remains the same, size, location, etc. This even happen in a low tech Database program (MyDatabase from My Software folks) today. The file was there but the data in the file was gone. In all cases I had to restore from backup. Any suggestions, I’m at a loss. Thanks in Advance.