"Windows Boot Manager
A recent hardware or software change might have installed a file that is signed incorrectly or damaged, or that might be malicious software from an unknown source.
If you have a Windows installation disc, insert the disc and restart your computer. Click "Repair your computer," and then choose a recovery tool.
Otherwise, to start windows so you can investigate further, press the ENTER key to display the boot menu, press F8 for Advanced Boot Options, and select last known good. If you understand why the digital signature cannot be verified and want to start Windows without this file, temporarily disable driver signature enforcement.
Info: Windows cannot verify the digital signature for this file."
Not sure where to go from here. Any help is very much appreciated.