How to Remove Trojan:Win32/Sisproc!gmb Virus - Removal Tips

I have scanned my mother's computer with MSE which it shows as being infected by Trojan:Win32/Sisproc!gmb, and advises as being 'Severe' and obviously the recommended action by MSE is removal. However when I tried to remove, the program hangs 3/4 of the way during and nothing happens after that.How can I get rid of it?

Information of Trojan:Win32/Sisproc!gmb

Trojan:Win32/Sisproc!gmb is an infection from Trojan family. Threats in this family can steal your sensitive information,download and run other files,delete security-related files from your PC,lower your PC security settings. Trojan:Win32/Sisproc!gmb virus can get into the computer along with email programs, instant messaging programs, file-sharing programs, social networking sites, removable drives with Autorun enabled, software vulnerabilities, etc.