Apart from having made nice labels for the disks that were going to help me out....
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I came to the conclusion that I do not want to waste anymore time in the old summerhouse Compaq DeskPro 590.
Added a Compact Flash card to get the 8 GB drive and a little more speed but after setting it up with the Setup disk I first of all get a 1782 Disk Controller Failure. Then after making sure that the cable was seated correctly I get a 1790 Drive 0 Size error - which is probably due to the amount of sectors on the flash card is too high for the BIOS (or the wmic command in Vista simply give me the wrong data).
I then decided against my original plan to take the 850 MB drive from my Venture 575 to install that one and set it up instead. That one I have the correct data from the Phoenix BIOS.
With this one there was no error messages and it loads into the Diagnostics disk I've inserted. However this require a reboot, and I've noticed that this computer really do not like to be rebooted as it will hang in there last screen shown - in this case a blank grey one while I hear the usual boot beeps (this time I can hear errors).
So no; I am done with it. I think I will take the soundcard out and use that one in the Venturis instead of the SoundBlaster PCI card to be able to install a PCI USB card and I might also see if I can make the GF4 PCI card work in the Venturis - mainly just to lower my loss on parts bought.
The main issue seems to be that I can do something - as long as I run the Compaq Setup utility at every boot because it somehow don't want to save the configuration although the 3 MB partition seems to be made. If I skip this step I don't have access to the hard drive - but as soon as I enter the Setup with my Setup disk, I can see that it is written to be correct. So I no longer can be bothered; despite reading various guides, forum posts and watched videos I can't seem to make it work.
While fighting with this I had my grandfather's old Amitech laptop doing an installation of Windows 2000: it is originally delivered with Windows XP although it only had 256 MB RAM (if I remember correctly) and has a sticker on stating that it is Designed for Windows 2000 Professional and Windows Me - and honestly even with a fresh installed Windows XP it was really slow. I've installed an mSATA drive instead of the original 2.5" IDE (which have kept - it also has the XP recovery sector of I want to convert the drive someday) and installed 2K - also to help me out making some of the Rompaq disks for the DeskPro to get that one running. I still need to install a bunch of the drivers, including the driver for the SiS 630 graphics chip.
The Venturis is also installed with 98 SE and just need the driver works as well.
So many computers, so little time...