The exact message is " Windows Live |Mail could not be started. The application was unable to open the Windows Live Mail Message Store. Your Windows Live Mailbox data is currently being used by another program such as a virus scanner. Close the program or wait for it to complete its operation before opening Windows Live Mail again. 0x800C0155, 997

However, no scanners are working with it - I have already defragmented it for problems

Any help would be appreciated

Thnx,

Nevin

error 0x800C0155 usually indicates a lack of permissions for the message database index. It often arises after performing database management functions which change the ownership of the index file. You should be able to correct it by taking ownership of the file:

1. Type cmd into the start search box and press Ctrl-Shift-Enter (all three keys at once). Give UAC permission to open an Administrator command window.
2. At the prompt in the window, type
   takeown /F "%localappdata%\Microsoft\Windows Live Mail\Mail.MSMessageStore"
   This will transfer ownership of the file to your Windows user account.

Now try starting Windows Live Mail again. Post any new error message in your reply.

Hi nblumer,

According to the error messages, please try the following steps to have a check:
1." Your Windows Live Mailbox data is currently being used by another program such as a virus scanner. "
We can try a clean boot to verify this :
How to perform a clean boot in Windows
https://support.microsoft.com/kb/929135?wa=wsignin1.0

2.Run the following command to repair the database:
Repair-
esentutl /p "%USERPROFILE%\AppData\Local\Microsoft\Windows Mail\windowsmail.msmessagestore"
Defragmentation-
esentutl /d "%USERPROFILE%\AppData\Local\Microsoft\Windows Mail\windowsmail.msmessagestore"
 Integrity-
esentutl /g "%USERPROFILE%\AppData\Local\Microsoft\Windows Mail\windowsmail.msmessagestore"
3.Apart from arnavsharma`s suggestion ,we also can try to change the permissions  for everyone with full control from the Secruity properties of the database folder.

Best regards