Initial colour set up

From: Pete
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I've just installed Photoshop 7 onto a new pc ,all my photo's i open up in photoshop have to have the colour balance adjusted to view on screen, they all show a Magenta cast and have to be compensated by around 35% . i'm sure there must be some way of setting this up so that a perfectly colour corect image appears the same in Photoshop. can anyone help on this?