System Restore is a feature that allows you to take your PC back to a point in time when it did not have any of the symptoms. Severe viruses will infect System Restore so you cannot remove them by going back in time. Simpler viruses do not. So when a virus attack it is time to restore your PC back to an earlier point in time and it depends on the Operating system you are using.
If you are unable to remove the virus, or cannot reverse any damage done by the virus to your operating system, no problem where ever you are in the US, we serve you better! "