An Apple ad bashing Microsoft's Vista OS, captured in the video above, became a viral sensation almost immediately after its launch, AdWeek reports. Running on CNET, Engadget and PCWorld, video of the the ad caught on with YouTube and blogs, including Valleywag. The only problem? While Vista may crash your PC, according to Apple, Apple's ad tended to crash users' browsers. Engadget editor Ryan Block went so far as to pull the ad temporarily and apologize to readers.