1. Back up the Registry by creating a restore point. 
2. Go to Start > Run (or Windows-key + R), type in regedit and hit OK. 
3. Navigate to the key HKEY_CURRENT_USER\Software\Cla sses\Local Settings\Software\Microsoft\Wi ndows\CurrentVersion \TrayNotify. 
4. Delete the values IconStreams and PastIconsStream. 
5. Open up the Task Manager (Ctrl + Shift + Esc), go to the Processes tab, select explorer.exe and click End Process. 
6. Open the Applications tab and click New Task at the bottom-right of the window. 
7. In the message box that pops up type in explorer.exe and hit OK. 
8. Explorer.exe will reload, and the missing icons should now be back in the system-tray where they belong. 
9. Then if the volume bar isnt there, go to taskbar properties (where the volume was gray) and simply tick the box. 

Take a rigistry backup and do it..

Thx for reply i have done this workout but doesnt work.

Have logged in different user and checked

Go to control panel-Folder  options-File types.

Select New. In the file extension Box , type exe, and  click Advanced.
Application should  come automatically. Click Ok

try with logoff but still icon disappeared.

vishal after put exe extention those setting come out in text document, see attach file.

http://smallvoid.com/article/windows-icon-cache.html

After typing exe did you  click advanced? Did application got listed automatically after you  clicked advanced?

i have try all suggest workout, still not solve.

I don't know whether it is related .Anyway direct migration from SEP MR5 to MR 6 MP1 is not recommended.The upgradation path should be RU5-->RU6-->RU6MP1..

In how may PCs you are facing this problem?If you click on that icon whether corresponding application is getting opened?

Thx for reply arvindkm,
Yes application is open but icon disappeared. I have facing 15-20 machine this issue. recently we using SEP MR 5 version and after upgrade SEP 6 MP1 the issue is come out. after that we stop upgrade activity for the time.

Which was the migration path ?.It was RU5--->RU6MP1  or RU5-->RU6-->RU6MP1?

It was RU5--->RU6MP1. its working nearby 200-250 machine. but some clients machine not working.

It is not a recommended path 
Symantec Endpoint Protection RU6 MP1 (11.0.6100) provides fixes since the release of RU6 and RU6a. This maintenance patch cannot be installed over any versions of Symantec Endpoint Protection or Symantec Endpoint Protection Manager prior to RU6. It must be installed over RU6 or RU6a.
Ref:Release Notes for Symantec Endpoint Protection 11.0.x and Symantec Network Access Control 11.0.x

Try to follow this path..

Have a look at this link
Icon problem after using TweakUI

No idea becoz earlier we installed MS update and SEP. same time rise this issue.

Did you check this 

Rebuild icon cache to fix incorrectly displayed icons

http://smallvoid.com/article/windows-icon-cache.html

Hi prachnad,

Their are many multiple link. but i have tray. no success.

Do you tried my earlier link?
Icon problem after using TweakUI

Yes. but as per my last post i said to you earlier i installed MS patch on few machine and 2--3 clients machine installed TweakUI this all machine having same issue also i have other machine which safariing this issue.

Any tool for same issue ,so i can revert my application icon again

Shell32.dll is responsible for loading icons..
Make sure your account have permission to launch this file..
Also check if you find any errors related to this file in eventviewer

Just want to alert everyone this thread is now included in the Security Solutions Contest - Be King For A Week!

Find out more here:
https://www-secure.symantec.com/connect/blogs/secu...

Best,

Eric

Hi Sameer,

I have got file called missing_association,  this will help you to re establsih the association , Can you please PM  me your  email id so that i can send that to you.
Once you rename the file to.reg and import it , i think the issue would be resolved.

Could just be the rights on the (if default) "C:\documents and settings\all users" folder have gotten mucked up.

Are you logged in with administrative rights or regular rights?

Logon as Administrator,

From a command prompt on 1 machine, try

CACLS "C:\Documents and settings\all users" /E /T /C /G everyone:F

See if that fixes your problem.

Try this
Rebuild icon cache as per this link
 How to Rebuild the Icon Cache in Vista
 

If it is windows XP the IconCache.db path is %user profile%\Local Settings\Application Data 

Refer this 

http://www.kellys-korner-xp.com/xp_tweaks.htm

Thx for all post
still i worried about my system. well this is a administrator / (XP system) account where icon is disappeared. already try this (http://www.kellys-korner-xp.com/xp_tweaks.htm) link result is zero.
Hi prchand you can post me solution sepadmin@jetairways.com.

Finally try this and see 

EXPLORER.EXE corrupted or infected?

1. open registry  then go to 

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Image File Execution.options 

2. Under this key there will be subkeys named explorer.exe and iexplorer.exe. Delete the explorer and iexplorer keys entirely. They should not be listed under the Image File Execution.Options key. 
3. Close the Registry Editor. 
4. Restart the computer. 

Hi Maheshroja,
Thier is no explorer or iexplorer exe.

Thx prachnad,
As per provide you file its work with my system. i am going to apply this activity all my pro. machine. thx again.
thx for all people for post me your valuable resolution.

Thx prachnad,
As per provide you file its work with my system. i am going to apply this activity all my pro. machine. thx again.
thx for all people for post me your valuable resolution.