Welcome to the forums jelaine.

You might have some adaware on your 2k systems. You can either download Microsoft Defender or Adaware and scan those systems.

You also may want to download Cablenut. Link here: http://www.testmy.net/forum/t-2097

Hope that helps!

I have Symantec Antivirus Corp edition, but it is running on both the XP and 2k machines. I've checked for adware, spyware, etc. There are 50 of the XP machines and 150 of the 2k machines. There are virtually no differences between the computers except the processor speed (2.8 vs 3.2) and the OS.

Yes, we're running 2k pro. xp and 2k mixed on same network connected to same router. Server is 2000.
I had to re-ghost a 2k this am (replaced a crashed HD) and found that it was twice as fast as the other 2K machines (running around 4.0 Mbps) when I was finished updating, etc. I checked a couple of others that had been ghosted not too long ago, and they were also faster. So, even though it doesn't appear there is any difference between the 2k computers and even though downloads, installs, etc. are prohibited, there obviously are differences. I'm going to try re-ghosting a couple other 2k machines and see if I get the same results.

Thanks--I will try your suggestion. The disks on the slower 2k machines had very little defragmentation. And the faster ones (recently ghosted) actually had slightly more disk space used than the slower ones. I defragged the slower one and saw no change in speed. I will keep an eye on the ones I recently ghosted that are running faster and see if they begin to slow down and then see if I can determine why.
I appreciate your suggestions and help. Thanks.