BackDoor.Generic3.FOG and BackDoor.SdBot.asr

Hi
Ewido and AVG anti virus software have between them detected 2 Trojan BackDoors:
SdBot.asr and Generic3.FOG
Although each programme tells me it has qurantined the trojans after each scan they still show up with every new scan.
Generic3.FOG seems to always be in WINNT\system32\wscript.exe
SdBot.asr moves around. It wqs in kernel32.dll, most recently in this:
system32\_delete_on_reboot_k_e_r_n_e_l_3_2_._i_m_e

I'm not sure if this request for help constitutes a HiJack This request or whether you can offer help. I hope so.
Thanks

 

Yes, both of them.