Please help with virus alerts

Whenever I reboot i keep getting a virus alert saying norton antivurus has detected a virus on your computer
object name:- C\windows\system32\hwclock.exe

virus name:- backdoor trojan

action taken:- unable to remove virus.

What do I do please?

  stalion 21:07 22 Sep 05

run a2 click here

  VoG II 21:11 22 Sep 05

click here

If a² will not remove it click here

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