Troj/PurScan-H is a downloader for an advertising-related application. It will download configuration data from a remote location. The data is used to display pop-up and advertisement on the infected computer. It has the ability to download executable code from a remote location. This trojan may then set the following registry entry: HKCU\Software\Microsoft\Windows\CurrentVersion\Run\NDrv = \ndrv.exe
Use antivirus (also check How To Remove section)Startup Optimizer to remove this trojan from your system.