thank you for the reply
I already tried this a few weeks ago, copyed all system files from c: to d:
and modified the boot.ini file to point to the correct drive...it did not
work when I took out the first HDD. I'm not sure now what was the error but
it's the usual when windows does not find it's system files; something like
this. I also talked to a guy from microsoft support (for another matter but I
asked him this also) and he said that from what he knows this does not work
(boot-ing from D when C is not available). He was only a first level support
or something and couldn't help me with anything anyway

. Anyway, the error
I got if I remember corectly is the same as the error you get on new
notebooks or PC's whith SATA HDD whithout the AHCI BIOS setting activated.