explorer.exe

File explorer.exe is malware or can be infected by malware:
Autorun Malware Malware, Conferox Trojan, Mumuboy Trojan, PAL.PCSpy Spyware
You must run antivirus software as soon as posible to check you computer.

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Also Be Aware of this dangerous files:

Also Be Aware of the Following Threats:
Removing Nuke.Miso Trojan
Starlogger Spyware Removal instruction