Recently I exchanged some data with my friend via his pendrive. A day after transferring the data, Microsoft Security Essentials caught a trojan named Alureon.A. Though MSE detected the trojan, neither could it remove it nor quarantine it. Worse was that my laptop was couldn't even stay on for even 2 minutes, it would simply reboot.
Somehow after a lot of research I download TSDD Killer from Kaspersky, the system rebooted, and then I ran it's scan and cured the trojan.
Just wanted to know whether it is completely gone or may come back too. Some forum posts on some other websites say that the problem gets completely cured by TSDD Killer while some say that a format and re-installing of Windows is necessary.
Can someone please give me a clear view about it? And I would also like to know the actual cause(s) for this trojan, Alureon.A.