You can't update the older programs which aren't made to use NTLMv2 authentication, so you would need to do these adjustments on the Windows 7 machines.
Control Panel - Administrative Tools - Local Security Policy
Local Policies - Security Options
Network security: LAN Manager authentication level
Set to Send LM & NTLM responses only
Set the Minimum session security for NTLM SSP
Disable Require 128-bit encryption
The screen shots below should be helpful.
Reboot all machines after making the adjustment.