@STUPIDA like i said it came out recently for public so all the software drivers may not be out. like in my case i got windows 7 pro from MSDN Academic Alliance. i got month before it was out for public. i usually wait for couple months after new OS is out but this time i forgot to wait and also i was tired with vista. So in my case my inbuilt microphone doesnt work at this moment cuz HP hasn't released windows 7 drivers. they will probably do it soon.  Beside that i dont find any problem with windows 7. i like it better than vista. just make sure you have recovery disk of your vista so if you dont like windows 7 you can switch back to vista or you can also do a partition and assign like 70-100 gb for windows 7 and have both OS on your computer and later if you like Windows  7 you can delete the other partition  & or vice versa.