Netware 6.5 on ML110 or ML370

[Rissmayer]

While trying to install Netware 6.5 on either of an ML110 or ML370 server, the installation fails just after de installation routine tries to start the "server.exe", all I can see is "initialize keyboard - ok", then "initizialize debugger" - then there is a millisecond error message (blue) with some memory adresses, then the installation starts anew without the possibility to stop.
No hardare failure (Win2003 and several diagnostics okay) - maybe incompatible with PCIExpress??!?!? Is there a chance to solve this with a newer SupportPack? Thanx.