File has been locked by another process

Make sure you don't save a file that is currently opened or locked by other process. A file which is locked for reading and reading while it is been used by another process should be unlocked after the process finish or the related file isn't been used any more. You also should lock your file while your are reading or writing the file so no resource conflict will occur.

If in Access, exit program and do a search for *.ldb. Sometimes on a slow or very busy network or if another user has that file open (Excel will do this too!)you will get this message.This *.ldb search may bring you to: system.ldb,*db.mdb etc.Deletethis file. Sometimes this occurs when not exiting the file correctly or power failures etc, or even a Ctl-Alt-Del had to be done to exit program. We run an Access97 Database with many users and includes JPG captures within Access (custom Obgyn Reporting program)
All this assumes you are Office of some sort.

I found a utility somewhere on the internet called nthandle.exe

This little baby will enumerate for you who is using what files. It will have to be run on the machine where the locked file resides. It's been invaluable to me.