No problemo, glad to help.
Wait a second, you downloaded SP3, check to make sure that your system recognizes a disk in the CD or DVD drive.
Now let me know if the drives recognize the disk OK. There's a fix for that if it does not.
Now I will give you excellent advice, and you can take it or leave it.
A. Turn off microsoft automatic updates, leave them off permanently. When you do this you will get message balloons on your desktop: Your computer may be at risk! Turn on automatic updates!
Install microsoft power toys XP Tweek IU from the microsoft website. Use Tweek to disable the message balloons on the desktop. This will not disable other messages.
Reason: there have been a rash of XP system failures that occur after automatic updates are installed. These include: loss of audio drivers, loss of desktop themes, CD drive will not recognize disk in drive anymore, blue screen on start up after updates, loss of printer and USB drivers, other assorted system failures. To avoid surprises and frustration, turn off the updates.
B. Install highly rated security system such as Norton 360 or Panda Internet Security 2010. Delete all other security systems. Run only a single all- in- one security package. Use the Norton or Panda fire wall instead of the windows fire wall.
You can buy these on amazon for about $20 per year. I just bought 3 license Panda for $10 plus shipping.
Reason: Much higher level multiple layer security with automatic updating. What you just went through could have been prevented. The Panda disk allows scanning the system without starting windows. This can come in very handy, on your system and other systems.