My command is this

bcp testdatabase.dbo.[dimension_72] in E:\HR.txt -S chennai\SQL2005 -USA -PSA -f E:\HR_unq.fmt -e E:\HR_unq_error.log -o E:\HR_unq_bcp.log -t "" -r

THe error is as follows:

SQLState = 08001, NativeError = -1

Error = [Microsoft][SQL Native Client]SQL Network Interfaces: Error Locating Server/Instance Specified [xFFFFFFFF].

SQLState = HYT00, NativeError = 0

Error = [Microsoft][SQL Native Client]Login timeout expired

SQLState = 08001, NativeError = -1

Error = [Microsoft][SQL Native Client]An error has occurred while establishing a connection to the server. When connecting to SQL Server 2005, this failure may be caused by the fact that under the default settings SQL Server does not allow remote connections.

I have set SQL server 2005 to accept remote connections as instructed in microsoft site.

then also same error