ZeroaAcess/Sirefef trojan

Running Win7 32 bit. Have Microsoft Security Essentials and Symantic Endpoint Protection from my university installed on my computer. 

 

I visited a forum the other day and I think one of the ads gave me this trojan...Norton has given me random pop-up messages saying quarantine failed, deletion failed, or that nothing was done.

 

Microsoft Security Essentials also has found several instances of it but is unable to remove it.

 

Can anyone help me remove this elusive trojan?