I am also having the exact same problem: After getting BSODs (which pointed to iaStor.sys) every 20min or so I decided to format the laptop and install my pre-owned copy of Win7 Pro SP1. I popped in the Win7 DVD and saw that the windows setup couldn´t find any HDD to install on. I downloaded the drivers from Intel (f6flpy-x64) and burnt them onto a CD. It took me a few tries (I kept getting error messages), but eventually the computer accepted the Intel Mobile Express Chipset SATA RAID Controller drivers. Finally, I could see the drives. So I deleted the 1TB partition, created two new partitions (~ 100gb and 890gb) and clicked on "format" on both of them. But when I tried to select ANY of them as the destination drive for Windows, I got the following message: "Windows cannot be installed to Disk 0 Partition 3. Details: Windows in unable to install to the selected location. Error 0x80300001." So now when I turn on my laptop (since there is no operating system or ANYTHING), I get a black screen with the following message: "Windows Boot Manager Windows failed to start; A recent hardware or software change might be the cause. To fix the problem: blablabla (nothing really helpful) Status: 0xc0000034 Info: An unexpected error has ocurred." Before reading this thread I also tried to change the SATA settings do AHCI and ATA, but both produce YET ANOTHER problem: Windows setup recognizes the HDDs, but it never gets past 0% from the "expanding files" stage of the installation. Please, can ANYONE help?
The operating system that is pre-loaded on my Dell Inspiron 7520 (a.ka. Inspiron 15R Special Edition) is Microsoft Windows 7 Home Premium. I have a retail version of Microsoft Windows 7 Ultimate and wish to do a clean install on my laptop PC. My laptop was able to boot up from the retail disk. After clicking "Install Now" and accepting the terms and conditions of Microsoft Windows 7 Ultimate, I checked the box "Custom (advanced" setup in which a new copy of Windows would be installed. The next screen that popped up contained the following bizzare message: No drives were found. Click Load Driver to provide a mass storage driver for installation". Could someone tell me where and how to locate the mass storage driver?
How do I do a clean install of Windows 7 on Dell Inspiron 7520 (a.k.a. Inspiron 
15R Special Edition)