py.exe is an executable file that starts a malicious process, launches certain parasite components or runs a destructive payload. Even if the py.exe file does nothing suspicious, its presence indicates that your computer is infected with a particular threat.
The py.exe file is installed and used by IELoader.
You are highly advised to scan the system, delete executable py.exe and terminate all the processes it started.
Please note that the py.exe file actually may be a fully legitimate part of the operating system or legitimate software. Often parasites use files with unsuspicious names, but malicious functionality. You should always carefully check the file before deleting it. It may not be related with malware, but can be required by your essential programs to work properly.
If your computer seems sluggish, or you are suffering from unwanted advertisements and redirects to unknown websites, we highly recommend you to scan it with reputable anti-spyware program. Do some FREE scan tests and check the system for unwanted applications that might be responsible for these problems.