Hi,
System Restore can not restore a system to it's original start. System
Restore monitors a core set of system and application files, archiving
the states of these files before system changes are made. System Restore
also saves a snapshot of the registry (note: some current registry
values will persist) and some dynamic system files. When System Restore
detects that the user is not actively using the computer, it compresses
the registry and any file copies made.
System Restore does not restore user data or documents, so it will not
cause users to lose their files, e-mail, browsing history, or favorites.
System Restore is also made available to users in safe mode, making it
easier for them to restore their computers to a state before problems
occurred.
Most system are shipped with a recovery method that will put the system
to it's original start. Check the system documentation on how to perform
a recovery. Warning, most recovery methods will wipe the system clean,
and destroy all data. So backup first.
All About System Restore in WinXP
http://bertk.mvps.org