Remove Trojan:Win64/Alureon.gen!A

Trojan:Win64/Alureon.gen!A sneaked into my PC a week ago. It made me so angry as I lost the completely control of the my PC. Firstly is the poor running speed that caught my attention. I checked the computer and found some strange programs appeared in the task manager. I ended these processes but my PC still ran very slowly even though I just operated one or two programs.

As time passed by, some system settings have been altered without my permission. For instances, my favorite homepage and default search engines have been changed. I tried to reset them back but all ended with failure. There are some unknown icons and shortcuts appeared on the desktop even though I had deleted them to the recycle bin, they appeared again next time when the PC is started.