I am running Windows 8.1 64 bit Pro
3.4 Ghz Intel Quad core
8 gig RAM
40 meg hard drive free

I have the little Windows 10 icon.

I received the following error at 28/07/2015 UK BST after checking for Windows updates.

"Upgrade to Windows 10 Pro
Installation date: ‎28/‎07/‎2015 11:20
Installation status: Failed
Error details: Code 80240020
Update type: Important
Install the next version of Windows.
More information:
Before you install Windows 10 Insider Preview - Microsoft Windows
Help and Support: