I now have 3 computers with this problem, A Lenovo Thinkpad X1 and a Dell and Lenovo. None have Webroot all are solid and pretty new machines. They are fine until Task Manager is opened and then the system completely bogs down to the point where I usually have to hard reset it.
On one of the machines I did a full reset and the problem came back again before any other software was installed. Again these are solid, business class machines that are working fine, but as soon as you open Task Manager the systems bog down so much they are unusable. Drivers and firmware are all up to date on all machines and nothing changes.