Failure installing Sql Server 2012 x64

Hello,

I am trying to install Sql Server 2012 x64 with SP1, but I am running into the following error(s). It occurs almost immediately after I run "setup.exe":

<error>

TITLE: SQL Server Setup failure.
------------------------------

SQL Server Setup has encountered the following error:

There was a failure to initialize a setting from type Microsoft.SqlServer.Configuration.SetupExtension.InstallSharedDirSetting.

Error code 0x8564000E.

For help, click: http://go.microsoft.com/fwlink?LinkID=20476&ProdName=Microsoft%20SQL%20Server&EvtSrc=setup.rll&EvtID=50000&EvtType=0x9F9575BA%25400x38AD03A5

------------------------------
BUTTONS:

OK
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</error>

Any ideas what else I can do to get past this?