AdCorp.

The popup blocker everyone installs isn't a program, but a force of cubicle employees that have to manually do the work. You work as a part time employee as one of these nameless drones.

How to play:
Close all of the popup ads before time runs out. Last through one week of work to beat the game. There are 3 difficulties that can be selected in the options menu by pressing escape or clicking the OS icon in the bottom left of the screen.