Last week I had some problems with opening the ConfigMgr Console. The weird part was that the error only appeared for one user. This was the error I got: MMC cannot open the file <driver>:\Program Files (x86)\Microsoft Configuration Manager\AdminUI\bin\adminconsole.msc. This may be because the file does not excist, is not an MMC console, or was created by a later version of MMC. This may also be because you do not have sufficient rights to the file.
Then I figured that, because the ConfigMgr Console is a MMC snap-in, it creates a version in the user profile. Because I use Windows 7 and Windows Server 2008 R2 it is located at: <Drive>:\Users\<Username>\AppData\Roaming\Microsoft\MMC\adminconsole.msc.
So after deleting the version from the profile and restarting the ConfigMgr Console it all worked like a charm.