Run time error occured while clicking the Log off

Question

Hello Experts,
I have customized masthead file. In the masthead, when i click the log off link, the pop-up window will showing the Runtime error message. Its not working properly. I didnt make any changes in log off method. I traced the error,
<%if (!isPreview){%>
          if (EPCM.getUAType() == EPCM.MSIE)
               if(EPCM.getGlobalDirty())
                     // unsaved data on the page, display modified dialog
                    var val = window.showModalDialog('<%=GetLogoffConfirmUnsavedMsgURL(componentRequest)%>', '', '<%=LOGOFF_CONFIRM_MSG_ARGS_IE%>');
                    if (val == 'logoff')
                         disableWorkProtectCheck = true;
                         logoff();
               else //no unsaved data
                    // data saved, nothing get lost on the page, display normal dialog
                  var val = window.showModalDialog('<%=GetLogoffConfirmMsgURL(componentRequest)%>', '', '<%=LOGOFF_CONFIRM_MSG_ARGS_IE%>');
                  if (val == 'logoff')
                      logoff();
          else
               if(EPCM.getGlobalDirty())
                  window.open('<%=GetLogoffConfirmUnsavedMsgURL(componentRequest)%>', '<%=LOGOFF_CONFIRM_WINDOW_NAME%>', '<%=LOGOFF_CONFIRM_MSG_ARGS_NS%>');
               else
                  window.open('<%=GetLogoffConfirmMsgURL(componentRequest)%>', '<%=LOGOFF_CONFIRM_WINDOW_NAME%>', '<%=LOGOFF_CONFIRM_MSG_ARGS_NS%>');
     <%}%>
In this code having if condition if(EPCM.getGlobalDirty()) is set as true means, then only properly executed and it shows the Log off message. In my part it goes to the else part. Then it shows run time error message.
I cannt able to find out the solution.Pls help me in this regarding.
Regards
Prakash T

Answer 1

Hi,
see if running SFC /Scannow helps. This basically restores missing/corrupt system files.
Click Start/Run and type CMD
Type SFC /Scannow
Description of Windows XP and Windows Server 2003 System File Checker (Sfc.exe):
http://support.microsoft.com/kb/310747/EN-US/
Please Reward Points if Helpful.
Kind Regards,
Vamsi.