<fx: Ian picks himself off the floor and between gasps for breath spouts>
No dear, XP is the Operating System. It is basically the translator between you and the 1's and 0's that the computer understands. Firefox is a program that lives on top of XP to allow you to view webpages.
The list of available Operating systems is
Microsoft
=======
XP
Me(Don't touch this with anyones never mind your own)
98 (out of service now)
95 (died about 4 years ago)
Others
=====
Linux (many different 'versions' each with a target audience)
Solaris ( if you like eating razor blades for breakfast)
AIX( If you and IBM are best buddies only)
Free BSD (linux fopr those who are into S & M)
BeOS(even more esoteric than Free BSD)
There are a few others but not that I would even consider a home user playing with
Realistically the only option you have to Windows is Linux. However you need to understand it is different to windows, Windows programs don't work on it. there are normally alternatives but they may not be as feature rich. However they do have teh benefit of being FREE!
So now Microsoft have finally started to lock out dodgy copies it is going to get very interesting to see what happens next.
Ian starts working out his new hourly rate!