Probably the best way around this, similar to what has been written above, is to get a second hard drive, and make it the master drive, making your original as the slave. This can be done with either the jumpers on the disks or with the cables, depending on your setup.
Install Windows2000 on the new hard drive, then boot into that newly installed system. This should allow you (provided you have administrator priviledges) to access the data folders on the old drive ( by taking ownership of the folders) and copy across your data to the new installation.
What you do after that is a matter of preference - leave the new system on that disk and re-build all the applications on the new disk, (preferable, as the old disk may have a problem), or reformat the old disk and re-install Windows on that and copy your data back to it, or whatever.
The main thing is to create a new Windows2000 installation on a new disk to access your data on the old one.
Cheers,
Alan