You say it is a genuine XP disk, but then get told the activation number has been used too many times.
This leads me to believe it is NOT a genuine disk, or if it is you are entering the wrong number, maybe a number someone gave you off the internet.
You seem very happy to download illegal copies of Office, and maybe use an illegal copy of Windows XP, and to ask for someone to get you a copy of Office 2000, and download ilegal copies of movies.
If you get a virus then you cannot expect people to have any sympathy for you.