cu.exe is an adware program Adware.iPend. cu.exe monitors user Internet activity. It sends stolen data to a hacker site. Related files: C:\Windows\cu.exe C:\Windows\ip.dll C:\Windows\Mach.exe More info: http://securityresponse.symantec.com/avc... Removal: Kill cu.exe process and remove cu.exe from Windows startup using antivirus (also check How To Remove section)Startup Optimizer.