Does wassapp work on windows?

while registration i got message like this an error occurred try again later  

I did as you have explained here yet I get pop up message saying: error occurred, try again. What should I do?  

First answer is not working on my window 7 PC and it is mentioned on mail dilog as new whatsapp and old whats app what does it mean?  

On a PC, launch the application and click Register, then input the mobile number of your phone, but first select the country and then input the IMEI of your phone. You can find your IMEI by using ...