is a legitimate startup entry related to Microsoft Security Essentials.
msseces.exe is loaded in the all users (HKLM) registry as a startup file name 'MSC' which loads as "C:\Program Files\Microsoft Security Client\msseces.exe" -hide -runkey.
Run keys are startup registry keys that are used to launch an application automatically when Windows loads.
There are two entries in WinPatrol because the startup is registered in two separate locations of Windows Registry.
This is the usual location
"MSC"="c:\program files\Microsoft Security Client\msseces.exe\" -hide -runkey"
This entry is for 64-bit Windows
"MSC"="\"C:\\Program Files\\Microsoft Security Client\\msseces.exe\" -hide -runkey"
The Wow6432Node registry entry indicates a 64-bit Windows version. The operating system uses this key to display a separate view of HKEY_LOCAL_MACHINE\SOFTWARE for 32-bit applications that run on 64-bit Windows versions.
When a 32-bit application writes or reads a value under the HKEY_LOCAL_MACHINE\SOFTWARE\<company>\<product> subkey, the application reads from the HKEY_LOCAL_MACHINE\SOFTWARE\Wow6432Node\<company>\<product> subkey.
32-bit and 64-bit Application Data in the Registry
On 64-bit Windows, portions of the registry entries are stored separately for 32-bit application and 64-bit applications and mapped into separate logical registry views using the registry redirector and registry reflection, because the 64-bit version of an application may use different registry keys and values than the 32-bit version. There are also shared registry keys that are not redirected or reflected.
The parent of each 64-bit registry node is the Image-Specific Node or ISN. The registry redirector transparently directs an application's registry access to the appropriate ISN subnode. Redirection subnodes in the registry tree are created automatically by the WOW64 component using the name Wow6432Node.