Ysbactivex.dll is an adware program Adware.Istbar. Ysbactivex.dll downloads and displays pornographic. Ysbactivex.dll monitors user Internet activity and private information. It sends stolen data to a hacker site. Related files: ISTsvc.exe IstBar_DH.dll ysbactivex.dll sfbho.dll sidefind.dll istrecover.exe istbar.dll ysb.dll istbarcm.dll ISTactivex.dll istdownload.exe sidefind.exe sfsetup.exe ysb(2).dll cmctl.dll juhpad.exe ysbactivex(3).dll ysb_regular.cab gjefpet.exe Adds the value: "[5 random ASCII characters]" = "[path to adware]" to the Windows startup registry keys. More info: http://securityresponse.symantec.com/avc... Removal: Remove ysbactivex.dll from Windows startup using antivirus (also check How To Remove section)Startup Optimizer.