In the web, browser, right after the IP address in the address bar, add /diagnostics.
When the page loads, you can disable lock file creation
It will probably just move on to a different problem. The firmware you have is from Jan 2008, the newest is from Jan 2010, way too old to support SMB scan to any current OS realistically, you would be much better off simply using FTP to the same share folder, then the Clients can stay how they are setup, and this printer can still scan.
The latest firmware is this one, but unless the file server is very old, I don't think it will help your situation. Netbios and SMBv1 have been all but eliminated.