Hotfix: Hyper-V backup can cause slow system boot / large registry files

A while ago I made an open offer to people to contact me if they had experienced issues using Hyper-V backup.  A number of you contacted me with reports of large registry files in the parent partition – that would slow down system boot over time. Well, after a lot of investigation we have figured out the cause and a hotfix is now available.  You can download it from here: http://