Yesterday evening. Changed the Hard Disk with 1 TB (type wd10eads) with a 500 GB (type WD5000aaKS) and having no problems at all.
I will get myself a new Hard disk and this will probably solve this issue.
So, Conlusion is that the Bios coundn't cope witth this 1 tb hard drive or that the Ultra
DMA CRC errors in data (24) as found with
HD Tune were so important that Win7 and Win XP didn't want to go further with this HD as being to insecure to work with.
Nothing else found.
Thanks for your support. It brought me to this solution eventually but it was hard to find.