Hp Pavilion Touchsmart 14 won't boot

Hello,

I have an ultrabook Pavilion Touchsmart 14-n020ed running win8.1

Product: F1D89EA#ABH

- Laptop won't boot and gives error: ‘System thread exception not handled (iaStorA.sys)’ and reboots over and over.

 - Automatic recovery gives same error.

 - Pressing F9, Boot from EFI file gives another error: ‘no volume label[Acpi(PZNP0A03…..’. Tried every *.EFI , which results in same error as above.

- Inserting multiple bootable DVD’s to recover gives this error: ‘Driver IRQL not less or equal (iaStorAV.sys)’

Please advice what to do. I need this laptop for my work urgently.

kind regards,
Peter