Windows 10: After using recovery disks i have no operating system.

Drivers: First, Windows now looks after these. Only investigate if problems or missing drivers.
Win 10 well may run on PCs that don't have Win 10 drivers available on the manufacturer's site. Manufacturer's produce lists of their PCs that are approved for Win 10.

But note that the drivers MS selects is from their list, so there is the possibility of a poor match. See the Tutorial section for ways of stopping Windows replacing older drivers you manually install (if you really have to).

Note that upgrading the OS for older machines runs the risk of low level driver problems which might lead to unexpected thermal issues in Safe Mode.

digitalcurisity said:

all the tool did was start installing Win10 on the computer that had the win8 reinstalled on then it asked for the Win10 product key that i do not have just the key for the Win8 as the win10 was downloaded as a free upgrade a few years ago. so i am now stuck with Win8 and it has no way of shutting down the system as there is nothing in the left hand corner. What a BIG waste of time glad i have other computers.

As Navy said, when installing, select "I don't have a key". If you install the same edition as before, it will auto-activate once it goes online. You're almost there - don't give up!

digitalcurisity said:

Using the recovery disks wiped the HD clean and there was no copy of the Win10 on it anymore, that is why i reinstalled my copy of Win8.

You can just install W10 clean. W8.x key is stored in the BIOS, so W10 install media will see that, and you click "I don't have a key" if it asks for one (but it shouldn't).