Restore Windows 10 Home to factory settings - can't disable Bitlocker

Hi

I have Windows 10 Home version and really would like to restore the PC to factory settings. The problem is that when I try to reset the PC it gives me the following message: “Bitlocker must be disabled to proceed. You can enable Bitlocker after this process is complete. Do you wish to continue?”. This is the first time I have come across Bitlocker and I understand that Windows 10 Home does not have Bitlocker. This has meant that I haven't been successful in trying to locate where the bitlocker function is. So if I type into the search bar near the start key 'bitlocker' or 'manage bitlocker' , nothing appears for me to try to disable. Similarly if I right click on the drive (I only have 'c' drive) there is no bitlocker option.
I thought I had success when I went to control panel – administrative tools – services, because I was surprised to see a file called BitLocker Drive Encryption which I changed from manual to disable.

There seems to be something somewhere on the PC to do with the bitlocker that is stopping me at the last hurdle from resetting the PC. Could you tell me where I am going wrong please? Your help would be really appreciated.

Thank you

You say restore to factory settings how are you going to do that? If you restore to a factor it may be years out of date and a seçurity risk best bet is to get latest version from media creation tool and put on the most up-to-date system

Thanks Caledon Ken and Samuria Guru

Samuria Guru - You raise a good point and perhaps I should be thinking about getting the latest version and I'd like that to be the next step although I'd really like to take the pc back to its original settings as a first task (there is a virus on the pc and I'd like to clear it away if I'm able to do that)

Caledon Ken - I looked at the guide which I hadn't seen before and unfortunately although I followed the steps, my PC search results didn't match what was displayed in the guide. So as a first step the guide asked to check the "Device Encryption Support" item (by going to System Information and then selecting System Summary.) In the instruction it says that if it reads "Meets prerequisites", then the computer includes support file encryption. Instead, next to Device Encryption Support it reads "elevation required to view" for me. This meant that I couldn't progress through the other instructions.
For example when I opened Open Settings and clicked on Update & Security and then looked for "Device encryption" it wasn't there. The steps also say that 'if the "Device encryption" page isn't available, then it's likely that your device doesn't support the encryption feature.' So I'm not quite sure what to do next. Any other ideas you have are greatly welcomed.

Many thanks

If you get the latest ISO boot from that delete all partitions that will kill any virus and give you a clean up to date system

Thanks all, I really appreciate your time in helping me solve the problem

Pejole2165 - I've added the screenshot of the disk management screen (well, hopefully it's been saved - I couldn't be sure when I uploaded it. I tried uploading 2 attachments, this and the Bitlocker screenshot but it seems only one has been saved to my reply). I have a virus because I have pop up scam notifications that arrive from the right hand of the screen and are of the size of a credit card. I can click on them to go away but of course they return.
I've right clicked the C:\ drive in My Computer and unfortunately there isn't an option to enable/disable BitLocker.
The message to disable Bitlocker is shown at the point that the PC would wave me through to resetting the PC to factory settings. The message acts as a gatekeeper which I can't get past so it sends me back to undo changes.
Apologies because I took a picture of that screen a couple of days ago which doesn't have great resolution (again hopefully it's saved to this reply).
I tried to right click next to 'Elevation Required to View' which is next to 'Device Encryption Support' (under
System Summary in System Information) but no options appear when I right click

Samuria and Caledon Ken - thanks for your insight and a clean installation would be an answer. To create a USB flash drive to store the Windows 10 update do you know what space requirement I would need on the USB to accommodate the Windows 10 programme download?

Thanks again