Btvclean.exe is a mass-mailing worm . Btvclean.exe monitors user Internet activity. Btvclean.exe displays advertising information. Related files: %ProgramFiles%\BTV\btv.exe %ProgramFiles%\BTV\breg_inst.exe %ProgramFiles%\BTV\btvclean.exe %ProgramFiles%\Common Files\Java\breg.cfg %ProgramFiles%\Common Files\Java\breg.exe Adds the value: "BTV"="%ProgramFiles%\BTV\btv.exe" "Breg"="%ProgramFiles%\Common Files\Java\breg.exe" "BtvC"="%ProgramFiles%\BTV\btvclean.exe" to the Windows startup registry keys. More info: http://securityresponse.symantec.com/avc... Removal: Kill btvclean.exe process and remove btvclean.exe from Windows startup using antivirus (also check How To Remove section)Startup Optimizer.