You can find more information about updating your operating system and restore points at the following websites:
http://www.microsoft.com/athome/security/protect/update.mspx http://www.microsoft.com/technet/prodtechnol/winxppro/support/restore.mspx
http://www.microsoft.com/athome/security/protect/update.mspx
http://www.microsoft.com/technet/prodtechnol/winxppro/support/restore.mspx