Thanks, the bcdedit commands worked a treat.
When the issue of driver signing has been resolved, and for those forum readers that are interested, here is an article on enabling the driver signing again:
http://www.itechtalk.com/thread7030.html
If you don't want to read the article, then the commands are:
bcdedit -set loadoptions ENABLE_INTEGRITY_CHECKS
bcdedit -set TESTSIGNING OFF