Installing Win7 on Raid mode Drive

Laptop Model Sony Vaio SVT13113EN
500GB HardDrive + 32 GB SSD
SATA Mode set to RAID

When i tried a clean install of windows 7 (Home premium) the installation setup couldn't detect my drive and I tried loading drivers from flash drive manually got the message "No signed drivers found.....".
No options to set SATA mode in BIOS.
Didn't know which driver to load tried all these drivers Intel Management Interface Driver, Intel Chipset Driver, Intel Rapid Storage Management Driver but got the same message.
Help me with the right drivers to install win7 or win8.....

Laptop Support page Support for SVT13113EN : T Series : VAIO™ Laptop & Computer : Sony India

Where did you get the installer? Use the latest ISO burned to DVD or written to flash stick from Clean Reinstall - Factory OEM Windows 7.

For Home basic you must download Premium ISO, run the eicfg removal tool to unlock all versions, choose Basic from the menu at boot.

If you have an EFI BIOS, you'll need these special steps to install to UEFI (Unified Extensible Firmware Interface) - Install Windows 7 with - Windows 7 Forums
and UEFI Bootable USB Flash Drive - Create in Windows.

Or you can Bypass UEFI to Install WIn7 which always works.

To understand more about a UEFI BIOS watch this video: Technical Note: UEFI BIOS vs. Legacy BIOS - YouTube

Thanx Guys fixed the issue by downloading the driver as a ZIP from intel download center, .exe files won't be loaded rather .inf files are only loaded at installation.