Trojan.Zeroaccess, & Other Trojan

Hello experts!

 

Came across Trojan on my PC & attempted to fix them with many tools, namely Norton power eraser, TDSS, MalwareBytes and Norton zero access removal tool. It seems that TDSS removed one Trojan, but after a scan with Malware bytes (with my USB plugged in to scan that too) A lot of Trojan have been revealed. Evidently, I need help.

 

The name of the Trojans in my Malware bytes quarantined folder are; Trojan.sirefef, Trojan.BHO, Trojan.Agent,  and there's

a few more.

 

I'm currently running Windows 7 Home premium 64bit operating system.

 

Thanks in advance.

 

Tunmise