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Microsoft Security Intelligence
Published Jun 29, 2016 | Updated Jul 11, 2017


Detected by Microsoft Defender Antivirus

Aliases: (Kaspersky) a variant of Win32/Speedchecker.C potentially unwanted application (ESET) PC Speed Up Pro (Sophos) PUA_SpeedUpMyPC (Trend Micro) Dropped:Adware.Relevant.CA (BitDefender) PUA.PCSpeedUp (Symantec)


This application was stopped from running on your network because it has a poor reputation. This application can affect the quality of your computing experience. We have seen this leading to the following potentially unwanted behaviors on PCs:

  • Adds files that run at startup
  • Injects into other processes on your system
  • Injects into browsers
  • Changes browser settings
  • Modifies your system DNS settings

These applications are most commonly software bundlers or installers for applications such as toolbars, adware, or system optimizers. We have observed this application installing software that you might not have intended on your PC.

If you were trying to install an application, you might have downloaded it from a source other than the official product's website.

We usually see this application installed on PCs in the following countries. This list is sorted according to prevalence:

  • United States
  • United Kingdom
  • France
  • Canada
  • Japan

This detection is part of our extended Potentially Unwanted Application protection feature.

You should contact your IT representative or network administrator to find how you can install legitimate programs while connected to your network.

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