Originally said by Poseidon:

- Look in your Control Panel under Programs and Features, uninstall Spiral Knights from there.

If it wasn't there use:

- If you used the downloadable client it may be installed in C:\Users\\AppData\Roaming\Three Rings Design\Spiral Knights (default setting, you may have chosen a different path). Delete this directory to uninstall.

- If you launched the game from our web site, you'll likely have it installed in: C:\Users\\AppData\LocalLow\spiral. Delete this directory to uninstall.