What is Windowsblock342.com?
Windowsblock342.com is a suspected website which is used to scare computer users with fake alert and then cheat their money by asking them to call the relevant technician to get support. And the popup from Windowsblock342.com is mainly caused by adware or PUP that has been installed on your PC. You should never be tricked by the pop-up from Windowsblock342.com; Otherwise, you may be tricked to pay money for fake tech support and get installed unwanted/malicious programs on PC at the same time. On infected, it will pop up on your screen like below: