Msupdprx.dll is a Trojan.Wayphisher.B. Msupdprx.dll monitors user Internet activity and bank information. It sends stolen data to a hacker site. Related files: %System%\dllcache\msupdprx.dll %System%\dllcache\msxml32.dll More info: http://securityresponse.symantec.com/avc... Removal: Remove msupdprx.dll from Windows startup using antivirus (also check How To Remove section)Startup Optimizer.