First of all, I just want to say thank you for reading my post. I am unable to install windows 7 on my system. It fails immediately after beginning the file expansion. It displays error code: 0x80070570 (full error message below) . Below are my system specs as well as my troubleshooting attempts. Windows cannot install required files error 0x80070570 The file may be corrupt or missing.. Make sure all files required for installation are available and restart installation. System Specs: Motherboard: P8Z77-V Deluxe http://www.newegg.com/Product/Product.aspx?Item=N82E16813131818&Tpk=p8z77 v deluxe I5-3450 @ 3.10 GHz 16GB (4x4GB) Corsair Vengeance 240 pin DDR3 1600 @1333MHz http://www.newegg.com/Product/Product.aspx?Item=N82E16820145345 HDD: At the moment I have (1) 1TB Seagate ST31000528s 5400rpm Power Supply: Corsair Enthusiast Series CMPSU-850TX http://www.newegg.com/Product/Product.aspx?Item=N82E16817139009 Video: Using the Ivy Bridge/mboard video at the moment Troubleshooting: My motherboard has both UEFI and Legacy BIOS. After some reading, I thought it might be due to a GPT/MBR conflict. All memory tests good, no faults. I changed the Compatibility Support Module setting to [Enabled] and selected [Legacy OpROM] only.Attempted install, no change. I removed all other hard drives other than the one listed above. No change. Did the following: "SHIFT+F10" then "diskpart." Selected disk 0, "clean"ed it, and used "convert MBR" command. No change. Used different install media. No change. Attempted install with all USB device except keyboard and mouse removed. No change. Attempted install of Ubuntu x64 12.04. Install successful. While usable, I don't know Linux. This won't work for me . I am at a loss as to what to do next. I have exhausted my tech knowledge and troubleshooting steps. Can you help me with this and get Windows 7 installed/working? Thank you so much for your help.