|Thanks for the message and the advice.|
OK - I have run the Mcafee uninstaller but it freezes half way through when removing 'MBK' so have been unable to do this.
I've installed and run all of the programmes you suggested - Malwarebytes found a couple of nasties which have been removed. The others found nothing.... and am still getting redirected when going on certain sites. I can't access www.mcafee.com either.
I am considering throwing the thing out the window!!! ;0)
Any help appreciated - thanks guys!