Dell, which has been investigating its books since August 2006, will restate its last four financial years – and may have to reduce earnings by up to $150-million. 

The internal investigation found that the company misled its auditors and manipulated results. It will now erstate from fiscal 2003, right through to the first quarter of 2007.
The restated income for the four years could be anything between $50-million and $150-million, with the biggest differences being in the first quarter of 2003 and the second quarter of 2004.
The internal investigation involved the examination of more than 5-million documents.
An SEC (Securities & Exchange Commission) investigation into accounting and financial reporting is still proceeding.