From the following Slashdot posting:
Microsoft Is Downloading Windows 10 Without Asking

"Microsoft, having learned nothing from Apple and the U2 album, have started downloading Windows 10 as part of Patch Tuesday for Windows 7 and 8 users. For people on a 32GB flash drive tablet, that's a big chunk of space taken up with something that they didn't ask for. Microsoft admits to doing this, but users are not happy. Way to look needy, Microsoft."