I used Spybot and found and removed a spyware. I also used Hijack This and found these files -- mssearchnet.exe, nvctrl.exe, and wkufind.exe -- and removed them, but the problem still remains, the icon and message keep appearing on the taskbar.
How to Detect Spyware on Android Phone - MalwareFox 9 Signs of Spyware on Android Phone 1. Your Phone is Sluggish. An app that spies on you requires many resources to run than a standard app. It will consume your RAM and CPU to perform the task. Due to this, your phone becomes sluggish. If you find that your smartphone isn’t performing well, then it could be a sign of spyware infection. Android spyware infections on the rise | Computerworld The vast majority of mobile devices infected with malware are running the Android operating system and a third of the top 20 malware threats for Android by infection rate fall into the spyware Powershell Trojan Infection - Virus, Trojan, Spyware, and
Signs of spyware infection. Common signs of a spyware infection are when the device behaves sluggishly, responds more slowly than usual during regular activities such as typing or web browsing
Spyware: What It Is and How to Protect Yourself | Kaspersky
U.K. Tops Spyware Infection Charts | CIO
How to Remove Adware and Spyware - Lifewire