MMC cannot open the file C:\Windows\system32\taskschd.msc
Well, that stinks...I just had it open yesterday.
This is a known bug in certain versions of Windows 2008 or 2008 R2
To Fix:
Open Explorer and go to directory:
C:\Users\USERNAME\AppData\Roaming\Microsoft\MMC\
and delete the taskschd file, (it has no file extension).
Or if you are Nervous Nellie, just rename it.
run taskscd.msc again and voila! It opens.
