Dual boot problem

Hi,

I decided to create a dual boot on one of my partitions. Currently I have Windows XP as my main o/s but decided to install Windows 2k professional for testing troubleshooting.

I installed windows 2k front DOS on my other partition; which boots fine. However my windows XP o/s will now not boot displaying the following error msg:-

windows 2000 could not start because:- file missing or corrupt: \windows\system32\config\system

I am a bit confused as this message is displayed even though I have selected to boot with my Windows XP O/S??

any help appreciated.