rob24
spybotsandra has responded to your post in the spybot forum this morning.
Thank you - didn't realise - I didn't have the notifications on!
They didn't see why Spybot was the issue after installing Avast 5. If any part 'would conflict', I have done what they suggested by turning off the Resident protection.
On restarting it made almost no difference, but on another restart it was ok again, no hang

. So not quite sure how that is has compromised matters, but have asked.