My hard disk has 12 partitions after windows update, what can I do?

Hello!!

I have a Dell Inspiron 17R 5737. The computer originally came loaded with Windows 8 and later 8.1. I upgraded to Windows 10 and after that to the Anniversary Edition. Recently upgraded to the Windows 10 Creators Update and my hard disk right now has 12 partitions!! yes, 12 partitions!! .... I need you guys help me to figure it out what to do to get rid of this mess. I´m afraid to delete something that could cause more problems than solutions. My partitions structure is UEFI/GPT. There is only two partitions that I created (as you can see in the screenshots):

1. Partition C: OS and software.
2. Partition D, named Warehouse: data, videos, music, photos ..... (in case of a clean install, I would like to keep this partition, if possible!! :))

The other 10 partitions have been created as a results of the many upgrades, and since the computer is working fine I haven´t paid much attention till now. Of course, the computer boots slowly and the same happen when restarted or shutdown. After the OS boot ,everything works fine but still I would like to get rid of so many partitions. I´m considering a clean install but I´m not sure which partitions can I safely delete. Here are the screenshots:



What can I do guys?? I want to go with a clean install, which partitions can I delete?? which partitions should I keep? can I keep my D partition with a clean install??

Any help would be much appreciated, Thanks so much in advance!!!

When you do the clean install, delete all the partitions as part of the clean install process, then you will end up with just 3 partitions as shown below:



Use this tutorial and delete all partitions as part of step 12 (see 100% unallocated).

Clean Install Windows 10

However, it looks like you could save your D partition (if it has no association with the OS) but I would back it up and just recreate it after the new clean install by shrinking the new C and then creating a new D partition.

Maybe someone else has a better idea but that is the way I would go.

Good luck,

WOT

And remember, a clean install will eliminate any OEM functionality that you may have had before.

Thanks a lot TV2 and WOT for your ideas, much appreciated .... I really like to keep my D partition, has more than 100GB of my music!! .... Any other ideas?

Yes, I would like to clean install the creators update

Yes both are installed by Dell. Partition No. 2 is for Diagnostics, and partition No. 4 is WINRETOOLS, looks like a manufacturer recovery partition with winRe.wim on it, but is dated 2013/2014 so it should be windows 8 related.