Windows XP Pro Program crashed

[GandT]

The computer that crashed is the only one hoster has been installed on. A friend of mine was trying to fix the computer a few weeks ago and removed hoster. I had to reinstall it. This computer is not conected to the internet so i had to use a zip drive to do the reinstall. Now I have taken it to a Tech and he said My Windows program had corrupt files and that it would be best to put a new windows program into it. Does that mean I have put on two computers. Since the first install was when I bought it and the second time being when I reinstalled it. Not sure how this works! I do have it backed up on an external drive.
I did buy the new update disc but have not updated yet. I bought Video Hoster 3.311 Software with Song Book.