Digital River doesn't host Windows 10 ISOs. However they can be downloaded with the Windows 10 Media Creation Tool if a key is provided.Yup, sounds like a repair installation is in order. That, or a whole fresh installation, if possible. You should perform a fresh install every year or two anyways, otherwise the system gets bloated and stuff like this happens. What I'd suggest is downloading the latest Windows ISO from Digital River - it's legal and free if you have a Windows key. Once you do that, create a bootable stick and copy over the installation files, there are plenty of guides online on how to do that.

