Symantec Endpoint Protection Installation Issue on Win7

Recently I had tried to deploy SEP on an Windows 7 client PC. The installation keep failing stated that the installation rolled back. This is a common issue for Windows 7 when trying to install SEP version 11.0. 

Here is the solution to solve this problem, it is caused by LiveUpdate.

To check the installation log

Click Start > Run
Type %temp% and click OK.
Open the file "SEP_INST.LOG" in a text editor, and look for the following text:
-- DECABI_LOGGING -- Enter LURegisterDecomposerABI()
-- DECABI_LOGGING -- LiveUpdate registration failed. (HRESULT=-2147221164)

If those entries exist, remove any leftover Symantec program files and then install Symantec Endpoint Protection.

To remove leftover Symantec program files

Delete the following folders (if they exist):
C:\Program Files\Symantec
C:\Program Files\Symantec Antivirus
C:\Documents and Settings\All Users\Application Data\Symantec\LiveUpdate
or c:\program data\symantec\liveupdate (Windows 7 or Windows Server 2008)
Install LiveUpdate by running the following file from CD1:
\SEP\LUSETUP.EXE
NOTE: Do not install LiveUpdate version 3.4 or newer (available from Symantec's FTP site). As of this writing, LiveUpdate 3.3 is the only version supported with enterprise products.
Install Symantec Endpoint Protection.

http://www.symantec.com/business/support/index?page=content&id=TECH102674&locale=en_US