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I'm trying to install Windows 7 Ultimate over my existing Windows 7 Professional. I downloaded the ISO from Microsoft and burned the install disc at the slowest speed possible (x3).

I booted to the DVD, but at 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

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2 Answers 2

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.

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According to Error message when you use Windows Vista Setup to try to create a partition: "Error code: 0xE0000100":

Consider the following scenario. You have a Windows Vista-based computer. An image that the manufacturer created was used to install Windows Vista. The manufacturer used the System Preparation (Sysprep) tool to create this image. The computer's hard disk drive is partitioned into two or more partitions. The partition on which Windows Vista is installed is larger than 40 gigabytes (GB). Additionally, the size of the partition is a multiple of 4 GB. You run Windows Vista Setup. You delete the existing partition on which Windows Vista is installed. You try to create a new partition. In this scenario, you may receive an error message that resembles the following:

Even though the article is about an issue with Vista, additional searches revealed that the error code is usually related to a partitioning issue.

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