Hi Katrin,
Sorry to ask this question over and over, but the reason is network driver is the MOST common problem for all the symptoms you describe.
What I gather from your response is that the client only reboot ONCE. Is that correct?
When you run a clone task, Ghost client creates the virtual partition using DOS with the selected driver and then boot to that partiton. When boot to that partition, it will install the network drivers and run Ghost DOS client, ngctdos.exe.
From that point, ngctdos.exe starts communicating with the server and wait for a command from the server. But if ngctdos.exe finds that the network driver is not initialized properly, it reboots back to Windows to avoid staying in DOS partition for ever (if it can't communicate wtih server, there is no way the server can ask it to boot to Windows.) Usually, this happens relatively fast and it almost appears like it is booting to Windows, unless you watch it carefully.
In case if it does boot to Winodws straight, that means there is something wrong with the Virtual Partition creation. Usually this error is specifically reported to the Console but in your case there is no such error.
What kind of a partition layout do you have in this machine? Is it a single partition with Windows or some thing more complex? (such as dual boot or split boot systems)
How many disks do you have in this system? and what kind of disks are they (IDE/SCSI/SATA)?
Are there any disk protection programs installed in this machine that may prevent Ghost changing the MBR?
Krish