Dell Optiplex 745, XP Pro, SP3. Computer is 3 yrs old, 3G Ram. Fully secured and clean.This is what appears in Local Security Settings, Security Options: DCOM: Machine Access: 0:BAG: BAD:I am Administrator and the main user of this machine. Most Windows functions won't work IE, Office, Outlook, Security Essentials, copy & paste, all dead. Won't allow downloads (Dell tried to set us a remote meeting and computer won't allow anything. No System Restore, tried Safe Mode, cannot access User Accounts. I am locked out of my computer.Dell says it is a MS problem.I cannot open my documents. Word won't work. Excel won't open. I use this computer for work and have important files which won't open.Goggling BAG:BAD brought me an article from MS that the security system has changed. I have tried the directions and won't work. I hope someone understands what I am trying to explain. Dell suggested a full reinstall of XP but I'm afraid I will loose my docs., photos, music.I don't know what caused this, happened this week, I don't know how to fix it. System Restore is a white blank screen. Can't open anything or run scans "access denied' or the product is not registered. I get all sorts of errors. Please advise,Jane1 person needs an answerI do too

Hi Jane, Follow the methods listed below: Method 1: System File Checker (SFC) scan Perform SFC scan on your computer and check if that fixes the issues. See Description of Windows XP and Windows Server 2003 System File Checker (Sfc.exe) for instructions. Method 2: Repair install Perform a repair installation of Windows XP to fix the issue. Refer the following article for instructions: Perform a Repair Installationhttp://www.microsoft.com/windowsxp/using/helpandsupport/learnmore/tips/doug92.mspx Note Performing repair installation will not cause any data loss on your computer.Gokul - Microsoft Support [If this post was helpful, please click the "Vote as Helpful" (green triangle) button. If it helps in resolving your issue, click "Propose As Answer" or "Mark as Answer" button. By proposing/marking a post as Answered, or Helpful you help others find the answer faster.]