Oracle 9i can't start

We are using oracle 9i db server. when starting any database tools like enterprise manager,sqlplusw it gives the error message like this:
ORA -12638 Credential retrival failed
Please help me...

by setting the value as NONE the following error occured:
ORA - 01034 : ORACLE NOT AVAILABLE
ORA - Shared memory realm does not exist.
Additional info:
we have 2 servers. one is file server and other is db server. db server is configured as a mirror of file server. file server is a domain controller. recently our file server got crashed and we reconfigured it them this problem arises.(e.g.) to login to scott db we use
connect [email protected]

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