OS = Win7
I printed the instructions as suggested and walked through them step-by-step. First, the screen locker removal steps did not work; the product key provided is not/no longer accepted. Second, I booted into safe mode with networking and ran Rkill (iExplore.exe), Malwarebytes (MBAM), AdwCleaner, and attempted HitmanPro (64 bit). Each found a few issues and they were cleaned/quarantined/removed, with the exception of HitmanPro. HitmanPro found something like 154 items, including trojans, but I couldn't complete the cleaning process without a product activation key. It requires a payment of $25 and the free trial is nowhere to be found. After rebooting back into normal mode the blue MS Win Product Key tech support scam window reappears.
Any help would be appreciated!