Hello iris2011, welcome to Seven Forums!
There's not much you can do if there are no System Restore points listed, you may have some success with the "Last Known Good ..." option in this tutorial at the link below and be sure to post back with any further questions you may have and to keep us informed. Advanced Boot Options
Also have a look at this one. How to Repair Windows 7 System Files with System File Checker
This one shows how to have System Restore points created automatically, I prefer Method Two
myself, it's not much help with what you need right now but may be useful in future. System Restore Point : Create at System Startup