There seems to be a problem - System Restore will not complete once NIS 2010 is installed in Win 7 RTM. Give an error message after rebooting to the effect that an anti-virus program may be interfering with the process.
You can run System Restore by pressing F8 when booting, selecting Repair Computer and System Restore - that should work, but you can't run it from inside of Win 7 unless you uninstall NIS first.