“Windows cannot access \\share\share error code 0×800070043″, the output error like this prevents Windows 7 user from trying to access a samba shared folder in Ubuntu. If you get a similar error while accessing to samba network shares from Windows 7, you can try following method from granade in Ubuntuforums.org.
First of all, boot into the Windows 7 and then head to Start -> Control Panel -> System and Security -> Administrative Tools -> Local Security Policy -> Local Policies -> Security Options
Then, do the changes below:
Double click to set “Network security: LAN Manager authentication level” to “Send LM & NTLM responses”
choose “Network security: Minimum session security for NTLM SSP… ” (there’re two of these; disable both)disable “Require 128 bit encryption”.
See the picture: