Unknown user account. in XP

  knockin on 18:16 07 Feb 08

In the C drive /properties /security / Users and groups names dialogue box there is an account named "Account Unknown(S-1- xxxxxxxx-xxxxx...)" where the xxxxxx-xxxx is a long series of numbers of the type generated when a programme wants to ensure there is no duplicaton of a name.
Can anyone explain what this might be? I expect to see administrators and system accounts, in addition to the users I have set up, but have no idea about this. I have denied the account all permissions with no visible affects.Can I safely remove it?

  knockin on 18:52 07 Feb 08

Ill just leave it as is then.

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