Your Windows files consume over a third of your overall storage space (237GB).
Your Windows files consume over a third of your overall storage space (237GB).
The key to investigate is TreeSize from JamSoftware. In our workplace we frequently use it to address client concerns about excessive space usage on drives. Following the advice of @Krimmix would be ideal; if not, run TreeSize and share a screenshot for more assistance.
Disk Cleanup is included with Windows and handles temporary files securely. I'm sure much of that space comes from old Windows Update rollback files. Hibernate saves a portion of your system RAM as a disk image, allowing you to power off without losing data. If you don’t need this feature, you can free up space by executing the command from an admin command prompt: powercfg /hibernate off. This action creates a hidden file called "hiberfil.sys" on your C drive, which appears in tools like Treesize and WinDirStat. You can reverse it if you have sufficient storage, by running: powercfg /hibernate on