Windows 10: Deleting disk partitions - which of these are okay to delete?

I recently removed Ubuntu from an Ubuntu-Window dual boot to which I gave a portion of my disk.In the process of removing it, I discovered I had 4 other partitions other than the C:, taking up quite some space.I cannot tell which are the results/residues from the dual boot and which were there originally.Here are some

:)

 

Will deleting the factory partition render the recovery disk useless?

More than likely it is of no use NOW . The recovery disk is nothing more than drivers and some BS . You will not get the OS and recovering from a recovery disk only works if the drive partition is fine and has been untouched by any one .
The best thing to do is delete all the partitions and just install windows on the HDD make your own recovery disk and your done not to mention you get all that drive space back .

 

Can't delete partition

Since you cannot delete partition in Disk Management, then you can use DiskPart to delete a partition. try “diskpart.exe” in a run box. run the followingcommands:

list disk

select disk [ID]

list partition

select partition [id]

delete partition

If you are not familiar with diskpart, then I recommend free partition manager AOMEI Partition Assistant to delete partition.

 

Delete my W10 Partition

Do you want to safely delete your Windows 10 partition and use only Windows 7?

If Yes, then boot to your Windows 7, run msconfig, go to "Boot" tab, you will see something like this :





Choose "Windows 7" and click "Set as default", then choose "Windows 10" and click "Delete", restart if asked or necessary.
Now the boot information for Windows 10 has been deleted and you can safely delete your Windows 10 partition (make sure no important files are on the Win10 partition). To delete and extend your partition you can use many partition manager tools.