I installed windows 2000 and now windows xp no longer works

So, I already had windows xp but i decided that i also wanted windows 2000. I installed windows 2000 on a separate partition and i thought that wouldn't affect my windows xp install. But now when i try to boot into windows xp the windows 2000 startup screen appears and has an error message. But windows 2000 still starts up fine.
Here is a picture of the error message

 

in a dual boot you have to install the oldest OS first:

https://www.google.com/?gws_rd=ssl#q=dual+boot+windows+2000+and+xp

read through several articles on booting 2000 and xp on the above search site.

 

Thanks, I formatted my hard drive and installed Windows 2000 first. I no longer have that error message! Both work perfectly.

 

good job!

 

Or use a boot manager, like https://www.plop.at/en/bootmanager/download.html