After installing BLUESTACKS in your PC, perform following steps---
1) Connect Your PC to a good internet connection.
2) click on Continue and wait until the data downloading process is complete.
[ in this process the bluestacks window will show you a bar of "Downloading Game Data" which means that it downloading OPEN SOURCE ANDROID OPERATING SYSTEM {150mb-250mb}]
3) In 2G network it can take 1 to 3 hours depending on your internet speed and in 3G it can take 40 to 50 minutes.
4) After completing the process activate your Google Play Store account and Enjoy android games and apps in PC.