Yesterday, my laptop running Windows XP Pro SP2 booted up fine. I logged in, and ran SuperAntiSpyware and told it to do a scan. Today, I checked the laptop, and SuperAntiSpyware had finished its scan, and it only found a bunch of adware cookies. I told it to remove the cookies, and it prompted me to restart Windows. I clicked OK. When it rebooted the computer, it got to the point where the dialog box says "Windows is starting up..." But then the dialog box disappeared, and after a few seconds, the screen turned blue and said: STOP: c000021a {Fatal system error} The Windows Logon Process system process terminated unexpectedly with a status of 0xc0000005 (0x00000000 0x00000000). The system has been shut down. I powered down the laptop and powered it back up and got the same error. Then I tried booting into Safe Mode, and got the same error. Then I tried booting using the Last Known Good Configuration option, and got the same error. So it doesn't seem like I can get into Windows. What can I do? I don't even have the Windows XP Pro CD to try to do a repair install, because this laptop used to be a company laptop, and when the company went out of business, they let me keep the laptop but they didn't give me the Windows CD. And I don't have any XP CDs.

I see 3 options: 1. Find a friend with an XP Pro CD. 2. You could try the SuperAntiSpyware web site or tech support to see if there was a backup of the changes it made, and hope there is a utility to back off the changes. 3. Do a Dell restore to the way the box came from the factory. There is usually a hidden partition on the drive with an image of the original system.

Use this to access the hdd. It loads a copy of xp from the cd. Then see if there is a way to get to superantispyware to undo the last changes or possibly run a system restore from the recovery console. http://www.ubcd4win.com/ http://support.microsoft.com/kb/304449

That ubcd has a tool menu to fixmbr and fixboot.

Thank you for the suggestions. The people I know only have XP Home, my particular Dell laptop does not have a recovery drive, and that ubcd4win looks like it requires the XP CD which I don't have. But I did find out about an offending SuperAntiSpyware DLL that was causing the crash, and I had to boot from the Knoppix CD to rename it. Problem solved!