oracle 9.2 processes

I have installed Oracle 9.2i for WXP from the Oracle website for my wife's online class. It's certainly the biggest installation I've ever done on a computer -- 2.8 GB of junk.

My question is this: There are numerous processes started by the installation program including a server. I really don't like all these automatically starting processes and especially the server so I would lie to know if there are certain ones that can be disabled without affecting the program use.

OracleMTSRecoveryService
OracleOraHome92Agent
OracleHome92HTTPServer
OracleOraHome92PagingServer
OracleOraHome92NMPPeerMasterAgent
OracleOraHome92TNSListener
OracleServiceTest

Are all these necessary or can I disable some of them? I am capable of Computer Management.

-- 
"The income tax has made more liars out of the American people than
golf has." -- Will Rogers