We use ENGL toolkit with ZCM10.3.3

During installation of W7x64 the Client2 SP1 ir6 gets installed. It worked. Until recently we have a new batch of E6520 with a new bios A08.
With some of the machines the installation of the NWClient takes a long time (6 minutes) and ends with an error 0x8007007E (unknown error).

Has someone has seen this error before?