Softimage and the FLEXnet license server seem to work fine on Windows 7. Here are the most common issues we see here in support:
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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.
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Ports 2080 and 27000-27009 are blocked by the firewall
Solution: Add exceptions for the ports.
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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.
eX-SI 
The first solution sounds perfect. Perhaps you can also tell us how to do that?
I can’t use the program. I can’t use “save as” because a message tells me that the disk is write protected. I have two days in which to design 5 projects for a university course. The first two attempts at downloading the program had corrupted files. Is there any way to get a working copy, or can you provide the instructions for the necessary changes?
In Windows Explorer, right click the folder and click Properties. Then you can set the Read/Write property of the folder.
For Save As, did you create a new project? The default project is XSI_SAMPLES and it is usually read-only. If that’s not the problem, then it is something to do with the permissions of your Windows user account.