If i do the reset , i wouldn't be able to go back to win8.1 again? Which means i will lost my win8.1 activation code?

all it needs is to run the upgrade to an activated os connected to internet. if successful, you get w10. you don't need key in the upgrade process, and you don't need key to do clean install after that. it's this simple.

to revert to w7, do a clean install, use your key to activate online. if it doesn't work, do phone activation.

one year is a long time. it's up until july 2016. this is why for those who are not familiar with what is happening, don't upgrade so quickly. take your time, and prepare whatever necessary for the worst. the upgrade is a pleasant one if a user is well prepared for it.

uh? what is still possible bro? which part is this? the upgrade, or the fresh install? if you're asked for key during upgrade, you got the wrong windows iso. with the correct windows install media, the upgrade will proceed immediately.

cd/usb and updates methods will produce same outcome: an activated w10 after successful upgrade. i used the usb method created from iso also. painless.

Here is what i did in order to get advantages for this newly Windows 10 OS & get problems / bugs free. My devices is ASUS N53 series laptop with clean installation of Windows 10 Home x64

1. Perform ugrade from your Windows 7 SP1 or 8.1 using upgrade reserve or Media Creation Tool. Later, make sure the windows is activated. This is a MUST step in order to get Windows activated the official way.

2. Later, perform Clean installation from your created ISO USB / DVD burn disk by formating the OS(C:\) partiton. You will get a fresh OS later on. All the files/software inside C drive will delete. Skip for key request during clean installation process

3. Connect your Ethernet such as Streamyx (Setting in Stremyx modem remain unchanged, just the DNS server address in your Ethernet connect devices change to automatically by Microsoft. You can change it later on to Stremyx DNS or Google DNS) to get access to internet.

4. Perform this manual driver installation steps (in this case, ASUS N53 series laptop). Restart when required.

- Manual install the Realtek HD Audio Driver/Software. For low sound issues in Realtek, just change it in Realtek Software setting (disable the environment setting, play around with bit rate)
-  Manual install the Nvidia Geforce Driver
- Manual install the ASUS ATK Package for Windows 10 to solve out the Fn keys issues in Windows 10. After installation, tick the button in ATK App to access the Fn keys

5. Perform the Windows Update to download all the drivers update / Microsoft bugs fix. Restart when required.

6. Check the ”Device Manager” to make sure there is no error for all your built in driver. If error occur, just right click the driver and perform ”driver software upgrade” Microsoft will search & fix the problem for you. Make sure that the connection is on.

7. Install those ”optional features” from setting/ Control Panal. Make sure that the connection is on.

- Chinese/Malay/India languages pack (for keyboard typing, handwriting, speech) from optional features
- Language pack for OS language if you require from Control Panel language setting
- Microsoft. Net features from optional features
- Direct X Utility features from optional features
- Install the free Offline Maps for Malaysia from Microsoft built in App ”Here Maps”

8. Perform all the necessary software installation that you required. Here is some tips

- For me, Windows Defender is well enough for average users to get protection from virus or malware. There is not necessary to install another antivirus/ malware software to get protected. It will confuse & cause the OS to slow down
- You can also install Libre Office (latest beta version is great) to replace Microsoft Office
- No need to install additional adobe flash player because Microsoft Edge, IE & Chrome is built inside adobe flash player. On the others hand, Firefox & Opera require to install additional adobe flash player
- Install the Java Runtime Environment software because some software or browser may need it

9. For external devices such as the smartphone, printer, USB devices & external hardisks, just plug n play and allow Windows to search for necessary drivers for installation purposes

10. Set up all those setting in you control panel, software & apps You are feel to go & enjoy this final version of Microsoft OS for a very long time until your device is dead. It is excellent in a nutshell with clean installation !!!

Hopefully the above guides will help you all. Thanks

User with new laptop that supports BIOS/UEFI they have the cdkey stored inside, Win8 above will detect & install it without asking the key.

If your system had the key stored you can just skip the key in cdkey process, let the install finish then it will be activated when your system is connected online

If you already upgraded to Windows 10, reverting back to windows 7 you should have used the Asus recovery. not sure if it still works after you did a different Win7 installation.