All solved... never trust a friend who is a MSCE
He gave me this server as a present 'cause he thought that the cdrom drive isn't working, so I decided to use it to test sme7b8, but I couldn't succed in installing it via network... i get alway errors with anaconda...
10 minutes ago i tried burning the iso on a cdrom, put it in the drive and... tadaaaa... the installation is starting...
Probabilly the cdrom drive has some problems... the installtion is slooooooow... but it goes!!!