Validation Rule:
AND (
CloseDate <> TODAY(),
OR (
ISCHANGED( StageName ) ,
DATEVALUE( CreatedDate ) = TODAY()
),
Probability = 1.00//you can use isClosed = true also
)
AND (
CloseDate <> TODAY(),
OR (
ISCHANGED( StageName ) ,
DATEVALUE( CreatedDate ) = TODAY()
),
Probability = 1.00//you can use isClosed = true also
)