Hi, I have two partitons. One has Windows XP Home Editon, the other one has Longhorn 4051 Beta. Two days ago, I've formatted and overwritten Longhorn 4051 with Windows 2000. After I finished installing Windows 2000 and booted up, but I could only log into Windows 2000. I got a black screen when I chose Windows XP to log in.

I checked my boot.ini, it seems fine. Can anyone help me out here, please?

Unless you installed 2000 and XP both on primary partitions invisible to each other, they share a common "boot loader" (ntldr). This is why you always have to install the more recent version AFTER the older one. The Windows 2000 boot loader is not able to boot Windows XP, and when you re-installed 2000, it overwrote the newer boot loader. Anyway, I think this is the problem.

Try fixing the problem by booting on the Windows XP CD and "repairing" the XP install.

You could probably extract the necessary files off the CD...

http://www.dougknox.com/xp/tips/xp_repair_2k.htm

Boot with your XP cd and type fix MBR at the command prompt. Done.

i donot think so ,i think ,u should use recovery console from xp cd and type "fixboot" command!!!!!

Copy XP's ntdetect.com and ntldr over to the root of the 2000 partition