After uninstalling a different version I cannot install SEP.  I get the following message in SEP_INST.LOG:

MSI (s) (10:40) [16:40:08:319]: Windows Installer installed the product. Product Name: Symantec Endpoint Protection. Product Version: 11.0.6100.645. Product Language: 1033. Manufacturer: Symantec Corporation. Installation success or error status: 1603.

search for return value 3 and post the 10-15 lines above it as well.

In the log, serach for Return value 3 and paste 5-6 lines before that

Cleanup the registry using a registry cleaner or Cleanwipe if you have it (You can get this from Symantec by calling support)

Try using the MSI.

If it is not an option:

Make sure you're using the proper credentials (i.e. administrator id).

If it still fails:

https://www-secure.symantec.com/connect/articles/understanding-error-1603-fatal-error-during-installation

And if that still fails:

Look for malwares.

Do you see this error message when you look for return value 3?

Symantec Endpoint Protection (SEP) 11 client installation fails with the message "Pending system changes that require a reboot have been detected"

Hello,

What OS are you installing SEP on?

In your case, the Best practice is upload the SEP_INST.LOG

Once, we have the logs, we could provide you the Exact cause of your issue

However, as of now, the most we could understand is that you are receiving a Generic Error of 1603.

I would recommend these steps as under :

1) Reinstall Windows Script Environment

• • Windows XP
    
    Windows Script 5.7 for Windows XP
    http://www.microsoft.com/downloads/details.aspx?familyid=47809025-D896-482E-A0D6-524E7E844D81&displaylang=en
    
    Windows Script 5.6 for Windows XP and Windows 2000
    http://www.microsoft.com/downloads/details.aspx?displaylang=en&FamilyID=c717d943-7e4b-4622-86eb-95a22b832caa
    
     
  • Windows 2003
    
    Windows Script 5.7 for Windows Server 2003
    http://www.microsoft.com/downloads/details.aspx?familyid=F00CB8C0-32E9-411D-A896-F2CD5EF21EB4&displaylang=en
    
    Windows Script 5.6 for Windows Server 2003
    http://www.microsoft.com/downloads/details.aspx?FamilyID=887fce82-e3f5-4289-a5e3-6cbb818623aa&displaylang=en
     

Windows 2000

Windows Script 5.6 for Windows XP and Windows 2000
http://www.microsoft.com/downloads/details.aspx?displaylang=en&FamilyID=c717d943-7e4b-4622-86eb-95a22b832caa


NOTE: These links are provided for your convenience only.
 

2) Uninstall and Delete LiveUpdate

• Uninstall LiveUpdate via Add or Remove Programs
• Delete the following folders:

\Documents and Settings\All Users\Application Data\Symantec\LiveUpdate

\Program Files\Symantec\LiveUpdate
 

• Install the Symantec Endpoint Protection

3) Uninstall SPBBCDrv

1. Open Device Manager

2. Click View. Select show hidden devices, then click Non-Plug and Play Drivers. 

3. Is there a SPBBCDrv line item? If so, right click on it and select Uninstall  
4. Reboot the machine, then try to install the SEP client.

Hope this Helps!!!

OS is Windows 7.

Attached SEP_INST.LOG 

Attachment(s)

SEP_INST.LOG__8.txt   7.88 MB 1 version

In the registry,

Find

HKEY_USERS\.DEFAULT\Software\Microsoft\Windows\CurrentVersion\Explorer\User Shell Folders\AppData
value=%APPDATA%

and change it to

HKEY_USERS\.DEFAULT\Software\Microsoft\Windows\CurrentVersion\Explorer\User Shell Folders\AppData
value=%USERPROFILE%\AppData\Roaming

Install SEP client again.

or 

install Liveupdate first and then isntall SEP

you can find the lu 3.3 in 

ftp://ftp.symantec.com/public/english_us_canada/liveupdate/3.3.0/

I've already tried all of the following with no success:

- Liveupdate does not appear in add/remove programs

- There is no SPBBCDrv in the device manager

- cleanwipe

- by hand uninstall and registry cleanup

- HKEY_USERS\.DEFAULT\Software\Microsoft\Windows\CurrentVersion\Explorer\User Shell Folders\AppData
value=%USERPROFILE%\AppData\Roaming  change

- Installing Liveupdate first

have you disabled UAC?

is the reginal language settign on the computer english?

UAC is disabled.

The language is US English.

you tried all the steps mentioned here..

https://www-secure.symantec.com/connect/articles/sep-installation-rollback-windows-7-windows-vista-windows-2008

The problem was that the Widows Event Log service was not running.  It was set to start automatically but it was not starting.  Once I got it going the install completed sucessfully.