Running low on storage space on a Windows PC can slow down the system. File Explorer has search filters to help identify large files. To find large files, open File Explorer (Windows + E), select a folder or drive, and use search terms like size:gigantic for files over 4GB, size:huge for files between 1-4GB, or size:large for files from 128MB to 1GB. You can combine filters for specific file types, such as .mov size:>300MB or .exe size:>100MB. To delete files, right-click and select delete, which sends them to the recycle bin.