Error when i build the project vs 2003

all the problme from vs 2003.
what are the consideration need to take, when we build the application(it was alreardy developed on other machine.)

i need to change the code, i had the code im wokring with offline(not using the vss).

i add one by project , and build ' i got the following the error(Folder 'HP.PSP.DataAPI.DAL_CallCenter.GetNextInternalUserId()' is obsolete: 'This method only necessary prior to migration of internal user to new table.'
).


i m getting this error only.

2)DataObjects.User.GetInternalUsers(DataObjects.PSPDataStore)' is obsolete: 'Method not needed after internal users are migrated to new table'
3.)The keyword new is required on .DataAccessObjects.CallCenter.IncidentHistory.ID' because it hides inherited member 'ObjectDb.DataServices.ObjectPackage.ID'


and explain us what are the considerations for vs 2003.