On Win7, SSO feature is provided natively by Windows OS.
You do not need to provide any options to install SSO as it was needed for XP install.
After doing a basic PROSet install on Win7, use Administrator tool to create a SSO profile and apply the ITAdmin package on the client machine.
But, functionality of SSO is different on Win7 from XP. There is ample documentation in PROset help file regarding SSO on Vista/win7.
If you have a particular requirement for SSO, please mention here and I will try to assist.