Do you want to update it to the latest of that OS and go on from there? You should be aware that some of the older windows update databases got rather too big, and you may need to run some manual updates or the update system will churn and churn and not get anything done. I think this is for XP more than Windows 7, but honestly, I can't remember anymore. Probably best to ferry those enabling updates to your system via usb before you hook it up online too.
Other people can give you the speech about not using end of life Windows, if you want to hear that. :)