Hello, I installed windows 8 consumer preview and now iI can't get rid of it.
More aboutwindows consumer preview
Its NOT uninstallable...
You have to format and install 7 again...
All the best Brett
or you can upgrade to windows 8 retail. If you have a newer machine with secure boot you might have to disable secure boot in the BIOS before you can make a change to the OS partition and install another OS