Mspbbase.dll is a Trojan Backdoor.Powerspider. Mspbbase.dll tries to terminate antiviral programs installed on a user computer. Mspbbase.dll monitors user Internet activity and private information. It sends stolen data to a hacker site. Related files: %System%\iexplorejj.exe %System%\IEXPLORE.EXE %System%\mspbhook.dll %System%\psinthk.dll %System%\Mspbbase.dll Adds the value: "mssysint"="%System%\Iexplorerjj.exe" to the Windows startup registry keys. More info: http://securityresponse.symantec.com/avc... Removal: Remove Mspbbase.dll from Windows startup using antivirus (also check How To Remove section)Startup Optimizer.