i chose the wrong cpu cooler when i ordered my pc two days ago would they change it to the one i wanted if i rang up/email i have gone with finance so would that be a problem
I believe people have been able to make minor edits to specs bought on finance without too much trouble.
PCS don't work Sundays, so they won't be building or shipping your PC tomorrow. Therefore you should be fine to call them on Monday and discuss options
Would you like to post your full spec for feedback? There may always be a couple of further tweaks people could suggest that you could get seen to at the same time, potentially. Or if the spec's perfect as-is then at least you'd get feedback to that effect!