11 partitions on HDD after clean install

Hi, as you've just done a clean install, much the easiest way to deal with this is to redo that, but deleting all existing partitions you don't need.

Perhaps the only partition that may be of interest is D: - at 25Gb it may contain something of interest. I'm guessing the last 20Gb partition may be just a manufacturer's recovery partition - you can have a look and see what's in it. As the laptop is old, it might be e.g. to restore it to Vista or Win 7, say, as bought.

During the clean install procedure (tenforms tutorial Clean install Win 10, step 13 I think) you are offered a screen allowing you to delete partitions. That's the chance to clean up everything. (If there's a data partition you want to keep, you can, although its location on disk may affect the size of your C: partition).
Clean Install Windows 10

Now before you do anything like that, as you presumably have a bootable Win 10 installation, and an older PC, I suggest you take the chance to check everything actually works. Do you have drivers for everything?

What is the build you have installed? (Windows key + R, winver) or Settings, search for About.
If you created your bootable disk recently it should be 1903.

Your other option is to delete unwanted partitions- easiest with a 3rd party partition manager, which you'll likely need to make use of the unallocated space made available- such as Minitool Partition Wizard.

One of them should be labelled *:Recovery - being the one in use. The others can be deleted.

The choice is yours.

Sounds good. And once you've done that, make an early priority the creation of a base disk image of Windows with e.g. Macrium Reflect (free), and thereafter periodically a differential image, all to external storage, until the next build update (now probably around May next year). Thus you can restore the PC to a given recent state if necessary- even if the disk fails.