The flush of DNS entries in Windows 10 removes all entries and deletes incorrect records, as well as forcing the computer to repopulate all invalid addresses on screen every time they are attempted to access. Flush DNS Windows 10 This ensures that you are not accessing any invalid URL addresses, causing Windows 10 to reply promptly. Flushing the DNS cache in Windows 10 removes all information files saved in the cache, requiring computers to retrieve new DNS information.