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RE: Uninstall Pre-Installed WIN 10 From XPS 8900 and Re-Install WIN 7

Hi ScandiHooligan52,

>I purchased the XPS 8900 direct from Dell.  Didn't know Win7 was available,

I've built my own PCs since the DOS days.  I feel old. 🙂
Well, thanks to Microsoft, I HAD to by an XPS 8900 to be able to run Windows 7 on the latest generation of hardware.  Microsoft supports Windows 7 on the 6th gen Intel processors for only a few manufactures and only a few systems from each.
I've bought "a few" 🙂 used (and cheap) Dell systems from ebay to use as dedicated systems.  And, most of the tech places I work have used Dell.  So, imho, that meant I would buy a Dell PC (and hack it up!) to get a 6th generation Intel system.  Note,

Back to your question:
You need to fully format and wipe the Windows10 disk. 
Windows 7 install doesn't like to delete or modify a Win10 GPT partition(section) on disk.

There are some free disk tools that will delete and format a windows10 disk.  I think that the free easeUS version may do that (I have the paid version).

Btw, Win7 can install on FAT32, NTFS, or GPT.  It can install under UEFI or legacy.
But, you need to make sure that the boot disk type and BIOS settings are the same.
If you never want to use a disk over 2TB, you can use and stay with Legacy.  Imho, that's a very bad choice.

If you haven't changed the BIOS boot/disk setup, you should be fine with a blank disk with no partitions on it.
Btw, for what ever reason, I couldn't get my modified BIOS setup to self-boot a windows7 new disk.  I had to do what was suggested in the following article:

After I did the above, the system (XPS 8900) booted fine.  And, I was able to change other settings, like enabling SMART, and have the PC self-boot.  Before that, I had to choose the disk to boot from.  Maybe I missed something in the BIOS before, it was late when I was doing that install.

Good Luck!

Me: Geek to the nth degree. [:)]
HW/SW/Mech Engineer.

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