First of all, we'll make a boot floppy to enable you to get into your
system. Then, we'll look at a more permanent solution.
Take a look at the following article.
http://support.microsoft.com/default.aspx?scid=kb;en-us;301680
It's easiest if you have access to another system running Windows 2000.
Where the article says "Windows NT-based", read "Windows 2000".
For the [operating systems] section in the boot.ini file, try
multi(0)disk(0)rdisk(0)partition(1)\winnt="Windows 2000 01"
multi(0)disk(0)rdisk(1)partition(1)\winnt="Windows 2000 11"
multi(0)disk(0)rdisk(0)partition(2)\winnt="Windows 2000 02"
multi(0)disk(0)rdisk(1)partition(2)\winnt="Windows 2000 12"
When you boot from the disk, you'll get four entries. One of these should
boot your system into Windows 2000.
This method does not risk damage to your system. Once you're in, you can go
about backing up your data just in case the next bit goes wrong!
To restore the boot sector (this is taken from a KB article; I can't
remember off the top of my head what the menu choices are). When you go
through this, it should locate your existing Windows 2000 installation.
Ignore the bit about an ERD. If you made one, it would be pointing to the
wrong disk.
1.. Start Windows 2000 by using the Windows 2000 CD-ROM or Setup boot
disks.
2.. When Windows 2000 Setup starts, press ENTER to start, and then press
the R key to repair the existing installation.
3.. Press R again to initiate the emergency repair process to fix the
existing installation of Windows 2000.
4.. Press F to initiate the process that automatically repairs the
computer.
5.. If you have an ERD, insert the disk when you are prompted, and then
when Setup completes repairing your boot sector, restart your computer to
finish the process.
If you do not have an ERD, press L. Windows starts to search for the
installation and displays any installation that it finds. If the emergency
repair process cannot locate the Windows 2000 installation, reinstall
Windows 2000.
Hope this helps
Oli