Neeeeema,
A good way to find your product key can be found in
this TechNet Gallery article which offers a program to download that will retrieve your product key from the registry.
Another thing worth mentioning is that the
Windows XP and Office 2003 End of Support date (April 8, 2014) is now less than a year away.
Making the move to a modern operating system such as
Windows 7 or
Windows 8 is strongly recommended and will ensure that you’ll be receiving support for years to come.
Recently there was a
Springboard blog post written by Stephen Rose that not only covers what end of support means but has many helpful links to the free tools you will need to migrate from XP to a modern operating system, whether it be Windows 7 or Windows 8.
One more resource to consider is the
Springboard Series on TechNet which contains articles and videos to assist with your operating system migration as well as manage your new environment once it is in place.
Mike
Windows Outreach Team – IT Pro