Please follow below steps to install ASUS drivers if you want to use the backup files of ASUS Install Wizard folder or Driver CD after Windows 8 re-installed:
1. Please copy all the files in  C:\eSupport folder (ASUS Install Wizard folder) to an external storage device. If you already have a Driver CD, this step could be skipped.
2. Complete the installation of Windows 8;
3. Create a folder "eSupport" under C: disk and copy the ASUS Install Wizard folder back to your Windows 8 Notebook PC under this C:\eSupport folder.
4. Then download and install .Net Framework 3.5 from below :
http://www.microsoft.com/en-us/download/details.aspx?id=21
5. Finally, you could run ASUS Install Wizard.exe in  C:\eSupport folder or in the Driver CD to install all ASUS applications and drivers.