let me know if whether or not this works for you. The install should get past your extraction point (somewhere between 20 - 30%) and complete the installation successfully. You will not format the unallocated space. Install Windows 7 on the unallocated space showing. I personally deleted my old Vista volume, so besides my Dell Utility partition the rest of my space was all unallocated. Do not format any volumes unless if you're data is backed up and you need the additional space. Boot off the Windows 7 installation CD (or run the. Play it safe, shut down your PC and disconnect all USB devices (except the keyboard / mouse, they do not need to be disconnected). Change from "RAID Autodetect / AHCI" to "RAID Autodetect / ATA". Boot into the BIOS (press F2 while the Dell splash screen is showing). My Dell is an Optiplex 755, and what resolved my issue was this (note: you should install the latest BIOS update from Dell's website first): 1. I cannot speak for a non-Dell PC because my company is a Dell reseller, and I haven't had time to install Windows 7 on my wife's Acer laptop. It appears that the built-in Dell SATA drivers aren't recognized during the Windows 7 extraction portion of setup (when your BIOS is set with RAID Autodetect / AHCI).
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