Hello,
Many thanks for your reply,
I do use windows 8.1.
What is very strange is that before I formatted the computer, everything run flawlessly (the stamina was up to 6hours). Now it doesn't exceed 3.30 hours... so weird...
How is is possible that the system do not recognize my computer ?
I have formatted throught the "Vaio" Button and set all default setting from the computer.
Are there any solutions to fix my issue?