Xerox said last week that it will have to restate its earnings for 1997 to 2001 due to accounting irregularities. The move will reduce the company's pre-tax income for that period by $US1.4 billion. As a result of the restatement, 1997 to 2001 revenue has been reduced by 2 per cent to $91 billion, the Stamford, Conneticutt-based company said.