Follow the following steps. I removed the same virus before.

1) 用另一computer download Malwarebytes Anti-Malware from http://www.bleepingcomputer.com/download/anti-virus/malwarebytes-anti-malware, save 进 DVD disk/ CD disk/USB drive,

2) 在现在 infected computer, 放入USBdrive/DVD disk, right click, run as administrator, install the software. choose the free version, so you don't need to pay a penny. 

3) Then run the malwarebytes software, Choose Perform Full Scan. It will take some time. Once it finished, you will see it catches your spam. remove all. Reboot, then you are perfectly free of the virus.