Softimage and the FLEXnet license server seem to work fine on Windows 7. Here are the most common issues we see here in support:
The folder C:\Program Files\Autodesk Network License Manager is read-only. This prevents the license server from running, because it cannot write to the log file.
Solution: Make the folder read-write.
Ports 2080 and 27000-27009 are blocked by the firewall
Solution: Add exceptions for the ports.
Access denied errors when you try to save changes to setenv.bat
Solution: When you open a Softimage command prompt or start UserTools, right-click the shortcut and click Run as Administrator.