This is cute. Happy Hour Virus is a website that'll let you choose a fake virus for your computer to be afflicted with, so that you can sigh exasperatedly and leave work early.
Like a lot of clever things on the internet, this is an ad, in this case, an ad for an ad firm, TDA_Boulder in Colorado. The point they say they're making is that they're offering prospective employees a healthy work-life balance. OK!