Hi y'all! I have spent all of last night and this morning searching and trying to figure this out. Every time I start windows, I get to the part where it has the pretty blue screen that says "Welcome", and I get this error: "winlogon.exe" instruction at 0x00000000 referenced memory at 0x00000000. The memory could not be written. I was having problems with the video card before it happened, so I'm thinking it might be that. The only thing I've been changing/working on lately was trying to get the drivers to work. I had to disable agp440.sys to be able to start in safe mode, but unfortunately I got the same error. I also used my XP CD and used the recovery console to fix it. (That's how I disabled agp440.sys) I did a chkdsk c: /R and it said it found a few errors and fixed them, but after rebooting, I got the same error. I have linux on another hard drive and I ruled out the netsky virus because I don't have a winlogon.exe in the /WINDOWS folder. Of course I might still be wrong. If anyone could help me out, I would really appreciate it! It's just hard to fix it when I can't get into windows.

How about trying a 'Repair' install? Do yourself a favor BACKUP! Sorry, I do not check for private messages

I actually tried that and it worked! Thank you!

SYMPTOMS When you log on to the local console of your Windows 2000-based computer, you may receive the following error message: The instruction at '<address>' referenced memory at '<address>'. The memory could not be read. Click OK to terminate the program. When you click OK, your computer restarts and subsequent logon attempts may be successful. NOTE: This error message may also occur if you log on by using a Terminal Services client. Back to the top CAUSE This behavior occurs because the operating system does not allocate a large enough buffer for the maximum string length permitted. When the data is greater than the buffer size, the Winlogon service terminates abnormally and your computer generates the error message. Back to the top RESOLUTION To resolve this problem, obtain the latest service pack for Windows 2000. For additional information, click the following article number to view the article in the Microsoft Knowledge Base: 260910 (http://support.microsoft.com/kb/260910/EN-US/) How to Obtain the Latest Windows 2000 Service Pack Back to the top STATUS Microsoft has confirmed that this is a problem in the Microsoft products that are listed at the beginning of this article. This problem was first corrected in Windows 2000 Service Pack 1. Back to the top MORE INFORMATION For additional information about how to install Windows 2000 and Windows 2000 hotfixes at the same time, click the article number below to view the article in the Microsoft Knowledge Base: 249149 (http://support.microsoft.com/kb/249149/EN-US/) Installing Microsoft Windows 2000 and Windows 2000 Hotfixes Kitty