I would first suggest updating the BIOS, you have a very old version at the moment; download this http://downloadmirror.intel.com/20008/eng/BLH6710H.86A.0110.EB.EXE and run from within windows, it will reboot the PC so save any work first.
There are a few oddities to do with hard drives mentioned in the release notes http://downloadmirror.intel.com/20008/eng/BL_0110_ReleaseNotes.pdf
World of Computers Ltd
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Thank you very much, the update was painless and it fixed the problem first go