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You selected the issue: Error 100

This error means that SteamVR program files are not stored in the correct directory.

Fix SteamVR installation path
If Steam was installed in a non-default directory, your SteamVR config/log paths may be referring to non-existent directories.

To fix your SteamVR installation path:
  1. Navigate to: ...Steam/steamapps/common/SteamVR/bin/win64
  2. Run vrpathreg and fix the paths to the correct drive and directory, or delete the openvr.vrpath file in user/AppData/Local/openvr

Ensure that hidden files are set to show on your system:
  1. Click the Start button > Control Panel > Appearance and Personalization > Folder Options
  2. Click the View tab
  3. Under Advanced settings, click Show hidden files and folders, then click 'OK'

On Windows 10, do the following to show hidden files/folders:
  1. Select the Start button, then choose File Explorer
  2. Select the View tab
  3. Check the Hidden items check box to view hidden items
Uninstall and re-install SteamVR
  1. Launch the Steam client
  2. Hover your cursor over the LIBRARY button
  3. Select TOOLS
  4. Locate and right-click SteamVR in the tools list
  5. Select Delete Local Content

Once uninstalled, double-click SteamVR in the tools list to re-install.