Just as what antivirus suite you are using and why you need to do this.
Example issue at http://www.google.com/search?hl=en&q=Norton+System+Restore
Just FYI, this happens with other AV suites so research it.
When I select a date to restore the computer it goes through the process but when the computer is restarted I receive a message saying it cannot restore and asks me to select another point. However no matter which date I select it produces the same result. What can I do?