You need to open the "Documents and Settings" folder on your hard drive. It is found on the same drive you installed Windows 2000 on.
Because you are working in a peer-to-peer environment with no Active Directory you are using local profiles. Ifthe profile still exists there will be a folder in the "Documents and Settings" folder that is named the same as the user account. If that folder is not there the account is gone forever. If that folder is there the contents of the profile are stillintact.
You might also see several folders with .000 extensions or other strangely named profile folders. If you do this is caused by another problem entirely.
Describe the contents of your "Documents and Settings" folder to me and we'll go from there.