Hi KarenThursby,
Thank you for posting your query in Microsoft Community.
From your problem description I understand that, computer does not start, system restore using command prompt failed.
I can imagine the inconvenience you have experienced. I will do my best to help you fix the issue.
I would appreciate if you could answer the following questions:
1. Have you made any recent changes to your computer?
2. Which antivirus application are you using?
3. What is the make and model of your computer?
4. Are you trying to perform system restore from safe mode?
Let’s follow these methods and check if it fixes the issue.
Method 1: Start your computer by using the Last Known Good Configuration feature in Windows XP.
Refer to this link:
**http://support.microsoft.com/kb/307852**
Method 2: How to fix a computer that won't start
Refer to the followig link:
http://windows.microsoft.com/en-US/windows-xp/help/setup/how-to-fix-computer-that-will-not-start
Hope this helps. If the issue persists or if you have any Windows related queries please get back to us. We are happy to help you.