[MiKTeX] mixtex error

[Megan D. <mck...@st...>]

i am getting the 'unknown miktex exception' error when I try to load  
packages. Trying to update I get the following error message:

MiKTeX Problem Report
Message: Windows API error 87: The parameter is incorrect.

Data:  
C:\ProgramData\MiKTeX\2.8\miktex\config\b1243728ad66496c7f4e1cdc43dbc418.fndb
Source: Libraries\MiKTeX\Core\win\winMemoryMappedFile.cpp
Line: 120
MiKTeX: 2.8
OS: Microsoft Windows 7 Home Premium Edition, 64-bit (build 7600)
SystemAdmin: yes
PowerUser: no
Root0: C:\Users\<name>\AppData\Roaming\MiKTeX\2.8
Root1: C:\Users\<name>\AppData\Local\MiKTeX\2.8
Root2: C:\ProgramData\MiKTeX\2.8
Root3: C:\Program Files (x86)\MiKTeX 2.8
UserInstall: C:\Users\<name>\AppData\Roaming\MiKTeX\2.8
UserConfig: C:\Users\<name>\AppData\Roaming\MiKTeX\2.8
UserData: C:\Users\<name>\AppData\Local\MiKTeX\2.8
CommonInstall: C:\Program Files (x86)\MiKTeX 2.8
CommonConfig: C:\ProgramData\MiKTeX\2.8
CommonData: C:\ProgramData\MiKTeX\2.8

Help please!