For all those who want to have a feel of Google Android OS can do so.You can run this Os on your windows using a standalone Android Emulator which is patched to run on a Windows PC as a standalone app without having to download and install the complete Android SDK.According to an article at RedmondPie XDA-Developers forum member xda2_haseeb has managed to extract and run Android Emulator on Windows which comes as a part of Google Android SDK package. Android OS for Mobiles can be tested and run on your windows now without having to download the SDK.Also You can even install Android compatible apps on it. This has been tested on Windows 7 as well.
Installation instructions for standalone Android Emulator on Windows
1. Download Android Emulator v1.5 for Windows.
2. Extract the contents of the .rar file.
3. Now rename the extracted folder to “Android-Emulator”.
4. Download the patched executable files from here.
5. Copy/Paste these patched files into the newly named “Android-Emulator” folder.
Download Android Emulator 1.5 for Windows