Using windows 10 pc - inastalled a new hard drive ( C ) when opening lightroom there are no presets - I am ousing Lightroom clasic on the cloud. I was under the impresion that the presets would be saved on the cloud - I may be wrong. Is there any way to download the satndard presets for lightroom clasic, thanks.
There is no "Lightroom Classic on the cloud". There is Lightroom Classic, and there is Lightroom (also known as Lightroom desktop). Lightroom stores images and presets in the cloud, so if you install a new drive then logging in again should restore your images and your presets too. Lightroom Classic stores everything locally. That is why I assume you use Lightroom Classic.
After you installed the new hard drive, did you copy over the presets? I assume you did not, so that would explain it. By default, presets are stored in a rather obscure place, you unless you know that and copied them that is the reason you do not see them. Here's how to move Lightroom to a new computer, which is essentially the same as moving it to a new drive: