I had to deal with this a while ago. I reinstalled WindowsXP during a massive worm epidemic.
Luckily for me, I had a free installer for ZoneAlarm (a firewall) backed up on a CD. So... I just kept the network cable disconnected, and installed WindowsXP. After finishing the install, I installed ZoneAlarm from the CD. THEN, I connected the network cable and connected to Windows Update. I had no problems.
I had to deal with this a while ago. I reinstalled WindowsXP during a massive worm epidemic.
Luckily for me, I had a free installer for ZoneAlarm (a firewall) backed up on a CD. So... I just kept the network cable disconnected, and installed WindowsXP. After finishing the install, I installed ZoneAlarm from the CD. THEN, I connected the network cable and connected to Windows Update. I had no problems.