As far as I know there is no setting for this, but if you remove this code from pop_profile, around line 140, it should do it:
if strDBNTUserName = "" then
Err_Msg = "You must be logged in to view a Member's Profile"
Response.Write " <table width=""100%"" border=""0"">" & vbNewLine & _
" <tr>" & vbNewLine & _
" <td><font face=""" & strDefaultFontFace & """ size=""" & strDefaultFontSize & """>" & vbNewLine & _
" " & getCurrentIcon(strIconFolderOpen,"","") & " <a href=""default.asp"">All Forums</a><br />" & vbNewLine & _
" " & getCurrentIcon(strIconBar,"","") & getCurrentIcon(strIconFolderOpenTopic,"","") & " Member's Profile</font></td>" & vbNewLine & _
" </tr>" & vbNewLine & _
" </table>" & vbNewLine & _
" <p align=""center""><font face=""" & strDefaultFontFace & """ size=""" & strHeaderFontSize & """ color=""" & strHiLiteFontColor & """>There Was A Problem!</font></p>" & vbNewLine & _
" <p align=""center""><font face=""" & strDefaultFontFace & """ size=""" & strDefaultFontSize & """ color=""" & strHiLiteFontColor & """>" & Err_Msg & "</font></p>" & vbNewLine & _
" <p align=""center""><font face=""" & strDefaultFontFace & """ size=""" & strDefaultFontSize & """><a href=""JavaScript:history.go(-1)"">Back to Forum</a></font></p>" & vbNewLine & _
" <br />" & vbNewLine
if not(strUseExtendedProfile) then
WriteFooterShort
Response.End
else
WriteFooter
Response.End
end if
end if