Ugh, I used the tool to upgrade to windows 10 from Windows 8.1 Pro w/ Media Center since Lenovo said my particular model wasn't going to receive the Windows 10 upgrade. Why? Because one particular model in the Y580 line had a hybrid SSD/HDD which isn't supported apparently.
I opted to clear out my old files since I had all my files backed up.
Now.... there is no option to revert back to Windows 8.1
I'm pretty sure it hasn't been a month...