Google is taking over my PC

My computer in work is now being taken over by Google, I got curious about Google desktop and Google Earth and started them up last week. Google Earth is a bit scarey that you can zoom right down to my street and you can see all the cars in our car park. If that is what is available for us then what do governments have??? The desktop thing scares me a bit more cause they can see exactly what is on your Hard drive. Every search they can do refreshed their records.......not that I have anything to hide, just don't like the idea of the snooping possibilities.