Google Earth saves downloaded image data to speed up loading times, which can be a problem if your hard drive has little free storage space available. Further, screen flickering, missing characters, texture anomalies and various other display issues can show up if the Google Earth cache contains outdated content. You can try to resolve these issues by deleting the Google Earth cache files from the Google Earth application itself or via a manual search through File Explorer.
Google Earth Installation
Click "File" on the Google Earth menu bar, then select "Server Sign Out" to disconnect from the Google Earth servers.
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Click "Tools" on the menu bar, then select "Options" to open Google Earth Options.
Click the "Cache" tab, then click "Delete Cache File." On the confirmation pop-up box that shows up, click "Yes."
Click "Apply," then "OK" to exit Google Earth Options.
Click "File," then click "Server Sign In" to reconnect to the Google Earth servers.
Exit all instances of Google Earth.
Press "Windows-R" to open Run. Type "appdata" (without quotes) and press "Enter" to get to the Appdata folder on your Windows 8.1 user profile.
Double-click the folders "LocalLow," then "Google" and then "GoogleEarth." If you cannot find the GoogleEarth folder, click "Back" twice and then double-click the "Local" and "Google" folders instead.
Select the files labeled "dbCache.dat" and "dbCache.dat.index," then press "Shift-Delete." After deleting both files, select the folder labeled "unified_cache_leveldb_leveldb2," then press "Shift-Delete."
Press "Alt-F4" to exit File Explorer.
Google Support also recommends that you clear the Google Earth cache first before troubleshooting errors such as "Unknown Graphics Card" and "Missing.dll."
Information in this article applies to Google Earth 7.1.2. Procedures may vary slightly or significantly with other versions.