Connie,
If you have not so by now, you might have to Power Off the system to stop the loop. Disconnect any external drives if you can do so without data trauma to the drives, remove any USB sticks and the like. Leave the monitor and keyboard connected. Pressing the power button for ten seconds may drop the system (shut it off). If ALL esle fails, turn off the switch on the surge protector to which you have your computer's power connected. Leave everything off for 15 seconds, or as long as you can stand it, and then switch on the power to see if the system will boot.
The downside to a forced shutdown is that the File System might be corrupted -- on the other hand, the File System may already be corrupted and that is why the Restore could not recover.
Years ago, it was reported that Norton could hang System Restore. I do not believe this should be a problem with the newer Norton editions. If you are using an old version of Norton, I guess it is possible that the software is locking up the Restore process.
If the system can be booted into Safe Mode, you might be able to run the System Restore successfully from there -- consider choosing a different Restore Point. System Restore frequently runs better in Safe Mode.
If the File System has been corrupted and you cannot clear the errors or the system won't boot, then you can consider doing a "Repair Install". This is an overload of the Operating System; your data and files will remain intact. READ the instructions - Repair Install does fix a bunch of stuff when nothing else will do the job.
I have provided two resources for this procedure for your consideration:
How to Do a Repair Install to Fix Windows 7
Good Luck!