There is also some issue upgrading from definitions 5725 to 5729, here is a
fix for it:
If you know what you are doing :')
Follow this, all credits to user "Taxman":
I have this same problem on both Desktop and one laptop.
This problem started after installing the nw build 614.
Does anybody have a work around this problem yet?
I did comlete manual cleaning of the registry and c drive
then I did re-install , but the problem still exists.
I chatted with a live person about this problem but you
know how far that goes. Nilch.. nada..