Seeing an app you don't remember installing appear on your PC is frustrating at best, and scary at worst. People have been reporting that an antivirus app called "UltraAV" has been installing itself on their PCs, which has caused some alarm bells to sound. Fortunately, if UltraAV has appeared on your PC, there's nothing to fear; the antivirus was part of the planned migration after Kaspersky was banned from the US.