completed job won't report.

1. BOINC has a problem opening or writing one or more files. One of the ways to get this error is by hiding the BOINC directory and its sub directories. Then BOINC can't find where it is running from.

Solution: Do not hide your BOINC directory.

2. BOINC finds that the file is open and in use by another process, or BOINC cannot write to the file.

Solution: Exit BOINC completely and restart it.

3. It may happen, that when an application hangs while opening/writing to a file and then terminates abnormally (e.g. via Task Manager or even BOINC), this (formerly opened) file may stay locked even if the application is terminated (due to file locks are handled by the OS - e.g. file locks on network shares are handled by the OS for the network PC/Server - the OS needs a definite "remove this lock!" from the calling application to remove it).

Solution: Restart your computer.

4. You installed BOINC as an administrator but run it as another user and didn't give that user rights to write to the BOINC directory/subdirectories. The directories their read-only attributes are set.

Solution: Either run BOINC as administrator, or give the user you want to run under rights to write to the BOINC directory and subdirectories.