Where is Windows XP Update routinere?

[thyde9337]

I have had to reinstall Windows XP on a Dell Dimension 4500 desktop but I
only have the Windows XP SP2 disk which I have used to install Windows.
Sometime before I had the computer problems that required me to reinstall I
had made a backup of the system uusing the Windows Backup program using
Start>All Programs>Accessories>System>Backup. After reinstallation of
SP2 I found that this option is not now available. Unfortunately I need
the backup to complete the reinstallation because I am unable to reinstall
the drivers for the Ethernet card which stops me from connecting to the
internet and the LAN. I can read the external hard disk in which my
backups are stored but I don't know which are the relevant files. In
addition, I was expecting the backup to reinstall the relevant registry
entries. I have tried without success to download the drivers from the
floppy disk which came with the Ethernet card, when I installed it in 2004,
but the computer hardware wizard is not even aware that the card exists. I
am using my Dell laptop to send this message.

Please can anyone help me?

thyde9337

My System

Dimension 4500, 2.53GHz processor, 1024Mb, XP, 160Gb hard disk, 80Gb hard
disk, Roxio CD R/RW, Blueyonder Broadband & LAN, Dell Photo All-in-One
printer. Iomega 500Gb hard disk, Toshiba 1Tb hard disk.

Dimension 4100, 1GHz processor, 256Mb SDRAM, ME, 20Gb hard disk, Adaptec CD
R/DW, HP Deskjet 840C, Scanjet 3300c, Blueyonder Broadband & LAN.

Inspiron 8600, 1.4 Ghz processor, 512Mb SDRAM, XP, 40Gb hard disk, Philips
CDRW/DVD disk drive, Blueyonder Broadband & LAN.

Netgear Router.