Combo.exe is a Trojan.Chimo.C. Combo.exe spreads by e-mail and via open network shares. Related files: %System%\combo.exe Adds the value: "combo.exe" = "combo.exe" to the Windows startup registry keys. More info: http://securityresponse.symantec.com/avc... Removal: Kill combo.exe process and remove combo.exe from Windows startup using antivirus (also check How To Remove section)Startup Optimizer.