Thanks for your advice. If I follow the guide you linked should I also disconnect the installed 2TB HDD when I try booting Windows from USB onto the new 1TB NVMe SSD I've ordered

That's a good idea I think I'll try that once I've got the XPS back and running again. I've ordered a Samsung 970 EVO plus 1TB NVMe SSD that hopefully should arrive this Friday so I'll be able to attempt a complete a fresh windows install from USB as per your advice 

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@rk38 wrote:

should I also disconnect the installed 2TB HDD when I try booting Windows from USB onto the new 1TB NVMe SSD I've ordered

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Yes.

When clean-installing Windows, it seems to help if your C-Drive is the only drive currently connected. By temporarily doing this, you are ensuring that:
- Windows gets installed to the proper drive
- Windows Boot Manager is (automatically) setup correctly and pointing to the proper drive (in your case, the NVMe SSD). SecureBoot is active, etc.

Later, after doing the Windows First Time Setup ... THEN you can start re-attaching/re-connecting any additional drives (and deal with any possible small issues surrounding that action).

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@rk38 wrote:

1. That's a good idea I think I'll try that once I've got the XPS back and running again.

2. I've ordered a Samsung 970 EVO plus 1TB NVMe SSD that hopefully should arrive this Friday so I'll be able to attempt a complete a fresh windows install from USB as per your advice 

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1. Right. Put it aside and possibly circle-back to it way-later (as it is not important). I just wanted to post that now while I was thinking about it. Definitely, instead focus on the XPS repair and getting it back the way you want it (software wise).

2. Excellent. If you have any questions or need further assistance, just ask.

The SSD arrived earlier than expected so I was able to do the replacement and everything went well and the XPS is back up and running now. Thanks for all your help really appreciate it. 

Good work. You are welcome.

Hi so it still isn't clear to me what the problem was with error code 2000-0151?? Did it have something to do with cloning because I had the same error code a year ago and couldn't find the answer for it I had a Dell Inspiron 3576 replaced the hard drive with a new Western Digital SSD things were great at first but now starting to act like it used to but no error codes no drivers were sent with the clean install because I didn't know you had to now things are all messed up live and learn

I have this problem too. At first the error I received on boot up apparently referred to the 2Tb D drive. Dell sent a technician and replaced that drive under warranty. Shortly thereafter I began getting the error noted above on bootup, but could not tell which drive it meant. Dell offered to also replace it for a cost, but I hesitated because the machine is working properly and Support Assist hardware checks pass OK.  Now, after reading this thread I'm nervous that I should replace.

1) My first question is that I'm not that technical so would like some advice on the best way to Backup the C drive so they can remove the current drive? It's a SSD drive but only 256 GB and pretty full.

2) Should I replace with a larger drive?

I also would like to do some other testing but am not familiar with the Crystal program that's mentioned here, or the exact way to run Windows drive checking. 3) Could you please point me in the right direction to run those tests?

I did get Crystal Disk Inf and the health of that drive says 3%.   windows disk check shows no errors.\-Brage66

@Brage66  - Exactly what PC model do you have and what version of Windows?  If your boot SSD is only 3% according to CrystalDiskInfo, back up all your files ASAP. 

Many users around here use Macrium Reflect (free for 30 days) but there are others like Acronis, clonezilla (free), etc.  You should create a full image of the entire SSD (all partitions) and save it on an external USB drive.  The imaging software should give you an option to create a bootable USB stick which you'll need to boot the PC after the new SSD is installed so you copy the image onto the new SSD. So be sure to prepare that stick in advance. Here's the Macrium guide to imaging a drive.

A larger boot SD would be a good idea, and the imaging software you use should give you the option to expand the size of the C: partition to use all the extra space on the new drive. So be sure you know how to do that with the software you choose before you begin.  Otherwise, the extra goes to waste.