Windows 7 install getting “Windows installation encountered an unexpected error”

Question

Trying to install Win 7 Ultimate over my existing Win 7 Pro. I downloaded the ISO from MS and burned the install disc at the slowest speed possible (x3). I booted to the DVD, but the second screen I am already getting an error! That screen I am choosing between "Upgrade" and "Custom". I am trying to choose "Custom" but then I get the error

"Windows installation encountered an unexpected error. Verify that the installation sources are accessible, and restart the installation.

Error code: 0xE0000100"

Anyone have any ideas? Thanks!

Answer 1

This error is often caused by issues with the hard disk, especially the MBR. There are a couple things you can try. I would first try running a chkdsk and have it repair/recover any errors it finds. If that doesn't fix it, check for invalid disk partitions. You may need a tool like Parted Magic to fix issues with invalid partitions.