reizend

I had the same problem with a Lenovo T60 right out of the box. I was not using WDS but I was using WinPE to deploy sysprepped XP images. Shortly after anything was ran in WinPE the system froze. I disabled an option in bios called memory protection, it is an attempt to prevent a virus from running code in RAM. Disabling the feature solved the problem. I would check to see if your machine(s) have a similar feature in the bios that could interfere with the WinPE ramdisk.