What service pack have you got? OS?
The security updates (normally called something cryptic like KB123456) must stay. On XP SP2 these should not be shown under add/remove unless you tick the box for "show updates".
The reason XP needs them is because its an 8 year old system, and a lot of flaws have been found since its inception.
Upgrading to Sp3 may help to a limited extent.
jbennet
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