I had an issue where I was trying to convert some Microsoft Virtual Server 2005 R2 images to VMWare images to run them on my mac. The images were running Server 2003. You don’t have to worry about it on WinXP images.
Using VMWare Converter, it would get to 97% and then fail. After some digging through the logs, I figured out that it was because the VS images were missing the Symbios SCSI driver. The fix was relatively simple. You need a copy of the server install media.
From a command prompt:
Now the converter will successfully import the machine.