Norton GoBack error 122

I was born into the 'Steam-Age', so anything remotely connected with computers baffles me!

 

But I really could use some help getting past the norton Goback error 122 screen, that has frozen my other PC that is running Windows XP home,

It states that if not done automatically, to do a scandisk, but as it has locked-up completely, inc mouse, I'm not able to do anything!

Is there some way this programme can be removed before Windows (XP) starts? because just as it's about to start, the norton goback cuts in and cuts it off.

 

Any help in old fashioned plain English would be welcome.

Thanks, gordon