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tmp.exe is a process belonging to an advertising program by 123bar. This process monitors your browsing habits and distributes the data back to the author's servers for analysis. This also prompts advertising popups. This process is a security risk and should be removed from your system.
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Remove the numbers from the program name, then google it. Since you say that it's a diferent number everytime, I assume it's doing that to trick weak antivirus. Hope that helps!