Problem while communicating with SQL Enterprice 2000 SP4

Hi guys,
I'm actually very new in this whole SQL enviroment,but i've bump into a unsolveable problem. I hope that some 1 in this forum would help to give me some tips on solving my current crisis. I've summarize the logs which i really din noe from which 1 to start troubleshooting from but the only similarity of the error that i found out is as the following:
[298] SQLServer Error: 8198, Could not obtain information about Windows NT group/user 'AMBANKGROUP sos'. [SQLSTATE 42000] (ConnIsLoginSysAdmin)
[298] SQLServer Error: 1115, Cannot generate SSPI context [SQLSTATE HY000]
[382] Logon to server 'AMBG2K113' failed (ConnAttemptCachableOp)
Can some you share with me some information on regards of the error shown above and solution tips to resolved this issue?