Trojan Viruses

Norton keeps detecting and deleting these viruses but they still keep coming back.

Trojan.Zeroaccess.B 80000000.@

Trojan.Gen.2 000000cb.@

Trojan.Gen.2 00000004.@

Backdoor.Trojan 80000032.@

 

They are all located in $RECYCLE.BIN

I run windows 7 64bit.

Can anyone please help