The Google Earth Help Center has many tips to help you successfully install Google Earth on your computer. Additionally, the Help Center has many troubleshooting tips that you can use to improve performance of the application.
If you cannot find the answer to your particular question, be sure to check out the Google Earth Help Group. This is a set of discussion forums where users read, post and share information about using Google Earth.
Finally, if you believe you have encountered an issue which pertains to a bug in the software, you can report the issue in the main Help Group. Before you do this, it is best to check out the aforementioned resources, as they may contain a solution to your issue.