Hewlett-Packard says it remains committed to Autonomy despite claims it had been mislead by former staff at the Cambridge software firm.
In a statement, HP said it was "extremely disappointed" by the findings of its internal investigation.
It added actions of former staff:
appear to have been a wilful effort to mislead investors and potential buyers, and severely impacted HP management's ability to fairly value Autonomy at the time of the deal
We remain 100% committed to Autonomy and its industry-leading technology.
After the PwC investigation, HP now believes that Autonomy was "substantially overvalued" at the time of its acquisition due to the mis-statement of Autonomy's financial performance.
HP has referred the matter to the Serious Fraud Office, US Securities and Exchange Commission's Enforcement Division and is preparing to seek compensation against various parties.
More top news
A rescued bull terrier was found to have more than 50 shot gun pellets and the crown from a tooth embedded in his face.
A dry night with clear skies will leave to frost and fog patches overnight.
A murder investigation has been launched after the discovery of a body in Milton Keynes.