jarotech :
Why do you want to change to Windows 7 ?
As you can see from JonAL Windows 8-8.1 has significant issues with it. I recently bought a new laptop Asus X55CA and migrated from WIndows 8 to 8.1 hoping that some serious issues would have been fixed but they were not.
Some examples:
1) I can not log onto my Windows 7 Professional system using Remote Desktop connection. Before people think that is a set up error on network - it isn't. I can connect to every other PC on my LAN. I get to the desk top of the Windows 7 machine from my laptop and but the password is not recognized. Obviously WIndows 8.1 is screwing something up in the communication.
2) Loss of features - Media Center is gone and even Media Player can not play DVDs. If you want Media Center then you have to upgrade to WIndows 8.1 Pro for about $130-140. After that you can then spend another $9.99 to buy Media Center from the Windows store. I use Media Center to drive my home theater so I certainly won't be "upgrading" that machine from Windows & Professional to Windows 8.1 pro or otherwise.
3) Microsoft store account required.
4) Super clumsy interface. I don't know who dreamed this interface up but everything is hidden and difficult to get to.
It seems to me that Microsoft has taken a direction that will be very good for other software makers as they will fill the void created by these lack of baseline features. This is kind of a "back to the future" scenario as in the old days Microsoft didn't have simple utilities to fix stuff in their own operation system and guys like Norton developed whole companies around filling the voids.
If this is the way of the "new" Windows I will be looking at Apple or a Linux system since Windows has become expensive, featureless and even more difficult to use.