Hey @chs117,
Welcome to the HP forums.
I understand you're on screen keyboard is not working after installing Windows 10 Preview on your tablet.
We cannot promise your device will work with any operating system other than what came with it, especially an operating system that is still in Preview. As the disclaimer for the preview warns, you may experience limited functionality and software/driver issues when using a beta operating system.
The only suggestion I can offer is to use the recovery media (which hopefully came with your device or you took the steps to create before installing Windows 10) and reinstall the operating system that came with your device.
Thanks.
Great-Deku-Tree
I work on behalf of HP
If you found this post helpful, you can let others know by clicking the “Accept as Solution” button. You can also show your appreciation, with a kudos, by clicking the “thumbs up" button!