something strange happened to me along those lines but not as seriously as you appear to have been affected. I know it's trivial very trivial but when I looked into the "start>programs>accessories" folder, programs such as snip, are missing, also a few others I hardly use. I can still start snip by making a shortcut to it but it is strange none-the-less. For me that isnt major and I do not think it is entirely connected to this version of BB but I will investigate further
Oh it's not serious for me, it is certainly usual misunderstanding or wrong doing from my part, but I prefer to list them here in case it is recurrent with other users or the devs have some advice to give me.