hmscott wrote:
scarletmeister, I know it is going to sound strange, but try disabling Bluetooth - and see if that solves the long shutdown/reboot times. If so your BT driver needs updating to the latest for Windows 8/8.1. And, if that is true, you likely need to update all of your Windows drivers.

Be sure and select OS as Windows 8.1 to get the latest drivers, going to the download area links below sometimes it comes up as Windows 7, or other, instead of Windows 8.1.

G750 support areas - The JM download area has the latest of all the G750, with JS/JZ next, the G750JW/JX/JH are out of date:
http://support.asus.com/Search.aspx?SLanguage=en&keyword=g750&ps=10&pn=1

Here is the latest Notebook Audio - for G750 => Realtek driver package Version V6.0.1.7283
http://support.asus.com/Download.aspx?SLanguage=en&m=Audio&os=30

Here are the latest Notebook Bluetooth drivers
http://support.asus.com/Download.aspx?SLanguage=en&m=Bluetooth&p=3&ft=27&os=30

Here are the latest Notebook WLAN drivers
http://support.asus.com/Download.aspx?SLanguage=en&m=WLAN&os=3

Here are the latest Notebook LAN drivers
http://support.asus.com/download.aspx?SLanguage=en&p=3&s=589&m=LAN&os=&hashedid=n%2fa

Notebook Asus SmartGesture
http://support.asus.com/download.aspx?SLanguage=en&p=3&m=ASUS+Smart+Gesture&hashedid=n%2fa

Notebook ATK Package
http://support.asus.com/download.aspx?SLanguage=en&p=3&m=ATK%20Package&hashedid=n/a

Asus GPU Tweak for Graphics Cards, currently at release 2.6.7.0 for the G750JW/JX/JH
http://support.asus.com/download.aspx?SLanguage=en&p=9&m=ASUS%20GPU%20Tweak%20for%20Graphics%20cards...

Asus GPU Tweak for Laptops, currently at release v1.0.9 for the G750JS/JM/JZ
http://support.asus.com/download.aspx?SLanguage=en&p=3&m=ASUS+GPU+Tweak+for+Laptops&hashedid=n%2fa

Here are the Asus posted VGA drivers, it's better to get the latest from Nvidia - currently 340.52, except for the JM/JS/JZ owners you probably want to keep using 332.60 to avoid random crashes - as reported by a lot of people.
http://support.asus.com/Download.aspx?SLanguage=en&m=VGA&p=3&s=111

thanks ill try it ! my vga drivers is already 340.52 can i downgrade it or something ? but i dont have any crash at all in playing , or haven't....

and when i try to login on my laptop the system said configuring update all the time , why is that ? is there a way to disable it ?

scarletmeister wrote:
thanks ill try it ! my vga drivers is already 340.52 can i downgrade it or something ? but i dont have any crash at all in playing , or haven't....

and when i try to login on my laptop the system said configuring update all the time , why is that ? is there a way to disable it ?

You can downgrade. Chose what version you want, download it and make sure you click "clean install" from the installation window. I'm using 335.23. They are pretty stable on my lappy... (JW)

scarletmeister wrote:
thanks ill try it ! my vga drivers is already 340.52 can i downgrade it or something ? but i dont have any crash at all in playing , or haven't....

and when i try to login on my laptop the system said configuring update all the time , why is that ? is there a way to disable it ?

scarletmeister, try to focus on 1 problem at a time. You said you were having long shutdown/reboot/startup, which I suggested turning off Bluetooth to see if that solved it, did you try that?

Why are you worried about downgrading your Nvidia driver? You have a JX, and can run the newest Nvidia drivers directly from Nvidia, no need to downgrade.

Updates need to be done, take the time to do them, and then you have a stable Windows configuration you can enjoy with only occasional new updates from Microsoft. Don't try to cancel the updates, or interrupt them, or power off to stop them, you will corrupt the update process and then you will need to fix that before moving forward again.

While under Windows, start Windows Update and check for new updates - be proactive to do the updates when they come in - that way you don't get caught doing a bunch of updates at shutdown or startup. If you have updates right now, and they are being done in the background, starting Windows Update will let you see what is going on and watch them being downloaded/installed.

And, above all else be patient and let the updates complete, or Windows will turn around and bite you with a corrupt update process that is a pain to fix...

To speed up future updates, replace the HDD with an SSD, it makes a big difference in reducing the waiting time for installs / updates.

Let us know if you run into trouble with the updates, there are few fixes to try.