"Known folders" errors in event viewer

I am using windows 7 x64 RC, My event viewer is filled with "Known folders" errors like this:

Error 0x80070005 occurred while creating known folder {3eb685db-65f9-4cf6-a03a-e3ef65729f3d} with path 'C:\Windows\system32\config\systemprofile\AppData\Roaming'.

Any ideas? Never seen this before.

This is my second time installing windows 7 Rc. I installed it yesterday, then mysteriously got a BSOD 0x0000007E (no error msg) today.