setup4156.exe is known to be a type of virus. This file, and possibly others, are running in the background on your system. Deleting these files immediately is very important.

180Solutions Spyware is a type of malware, and setup4156 is linked to it. Viruses and malware often masquerade as important files, so backing up your system before deleting files is a very good idea.

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Since setup4156.exe has been located on your system, you'll probably see more virus if you do a thorough search. You can avoid future problems with viruses and malware by using this free system scanning tool.