In general on Intel boards, changing the processor does not make any difference in the operating system, apart from increased /decresed performance.
The system would work as normal, no hardware change errors or warning would be generated.
It will not see it as a new computer or so. You do not need to do any updates or anything at all if you have changed the processor, provided the processor is compatible and you are using the same board.
So, you don't have to really worry as far as I know.
Hope this will be useful to you.
Good to hear. Just ordered the Core 2.