In
the welcome screen or on the file menu, click New or Open project. The
error
appears in an alert box as "Requested registry access is not allowed."
While this bug has been reported to Microsoft and they claim to have
fixed it for the next release, that doesn't help you if you are getting
this error right now. I came up with the following work around on my
machine:
Using Process Monitor I was able to find the problem registry key:
HKCR\AgControl.AgControl\CLSID
Read
access was denied. When I went to check the permissions I was informed
that I could not view the current permissions, but I could change them,
so I made myself the owner and added read permissions to the Everyone
user for
HKCR\AgControl.AgControl
HKCR\AgControl.AgControl\CLSID
HKCR\AgControl.AgControl\CurVer
As
I changed permissions on each key, regedit told me it failed, but if I
closed the permissions dialog and reopened it, I could see the new
permissions in place and Microsoft Expression Blend was able to open my solutions
without error.