Appmgmt.dll is a Trojan Backdoor.Fuwudoor. Appmgmt.dll spreads via open network shares. Related files: %System%\ipsec.dll %System%\appmgmt.dll %System%\browsvr.dll %System%\trkw.dll %System%\trks.dll %System%\kdc.dll %System%\dmsrv.dll %System%\mesg.dll %System%\netlogin.dll %System%\protstrg.dll %System%\lmhosts.dll %System%\w32t.dll %System%\ntms.dll More info: http://securityresponse.symantec.com/avc... Removal: Remove appmgmt.dll from Windows startup using antivirus (also check How To Remove section)Startup Optimizer.