If you really wanna show off your place to your friend or someone but you don't have any connection and then, This guide will help you to view Google earth in offline mode (Offline Google Earth) If you are using a slow internet connection or even you haven't a internet connection to your home PC but having fast internet connection in your working place or studying place to view Google earth without any problems
Method
1. Explore your interested places in Google earth using PC, which has been connected to internet with fast link.
2. Copy the cache file (dbCache.dat) from that PC.
You can find this file by following this path (for a typical installation of Google earth).
C:\Documents and Settings\******\Local Settings\Application Data\Google\Google Earth
(***** is for the name of account you logged in), like Administrator, Guest, or your username login
Copy icon folder also.
3. Install Google earth in your machine.
4. paste dbCache.dat and icon folder in to your machine according to the above path in your machine.
If your machine has been connected to Google earth server and viewed the globe at least one time then you have done 100% and now you can view your interested places using your machine.
But if your machine has not been connected to Google earth server ever or no internet connection then follow the below procedure further.
Now you have to do a simple registry editing. You have to create two new string values to the registry.
They are "Key" and "VID" under [HKEY_CURRENT_USER\Software\Google\Google Earth]
As "Key" you can put any 12 characters you want.
But the "VID" is a unique code for a given version of Google earth software.
5.copy these 4 lines to a text file and then rename it "***.txt" to "***.reg"
(Below i have given the "VID" for google earth version 4.0.2742)
REGEDIT4
[HKEY_CURRENT_USER\Software\Google\Google Earth Plus]
"Key"="000000000000"
"VID"="AAAACDQuMC4yNzQy"
6.Then double click on the file and press ok.
Finally you have done it and enjoy Google earth without an internet connection on your PC.
Some "VID" 's for various Google earth versions,
AAAACDMuMC4wNzM5 version 3.0.0739
AAAACDMuMC4wNzYy version 3.0.0762.0
AAAACDQuMC4xNTY1 version 4.0.1565 (Beta Version)
AAAACDQuMC4yNzQy version 4.0.2742
You can download the registry file for Google earth version 4.0.2742 from here.
target="_blank" http://rapidshare.com/files/26964820/4.0.2742.reg.html
Please don't try to edit any other registry keys. If you do so do it at your own risk.
The procedure has been tested with windows XP SP2.
Source: http://offline google earth. blogspot.com/2007 /04/offline-google-earth_21.html