每次开机都会有这些病毒，清除了开机是又再出现
Backdoor.Gpigeon.bc 清除成功05-08-04 CCENTER.EXE>>C:\WINNT\netdde_Hook.DLL
Backdoor.Gpigeon.bc清除成功    05-08-04     Ravmond.exe>>C:\WINNT\netdde_Hook.DLL
Backdoor.Gpigeon.bc清除成功    05-08-04     MSTask.exe>>C:\WINNT\netdde_Hook.DLL
Backdoor.Gpigeon.bc清除成功    05-08-04     RavStub.exe>>C:\WINNT\netdde_Hook.DLL
Backdoor.Gpigeon.5.a清除成功05-08-04 IEXPLORE.EXE>>C:\WINNT\netdde.DLL
Backdoor.Gpigeon.bc清除成功    05-08-04     IEXPLORE.EXE>>C:\WINNT\netdde_Hook.DLL
Backdoor.Gpigeon.bc清除成功    05-08-04     WinMgmt.exe>>C:\WINNT\netdde_Hook.DLL
Backdoor.Gpigeon.bc清除成功    05-08-04    svchost.exe>>C:\WINNT\netdde_Hook.DLL
Backdoor.Gpigeon.bc清除成功    05-08-04     svchost.exe>>C:\WINNT\netdde_Hook.DLL
Backdoor.Gpigeon.bc清除成功    05-08-04    Explorer.EXE>>C:\WINNT\netdde_Hook.DLL
Backdoor.Gpigeon.bc清除成功    05-08-04     Rundll32.exe>>C:\WINNT\netdde_Hook.DLL
Backdoor.Gpigeon.bc清除成功    05-08-04     RfwMain.exe>>C:\WINNT\netdde_Hook.DLL
Backdoor.Gpigeon.bc清除成功    05-08-04     realsched.exe>>C:\WINNT\netdde_Hook.DLL
Backdoor.Gpigeon.bc清除成功    05-08-04     RAVTIMER.EXE>>C:\WINNT\netdde_Hook.DLL
Backdoor.Gpigeon.bc清除成功    05-08-04     IEXPLORE.EXE>>C:\WINNT\netdde.DLL
请教如何彻底消灭?