Troubleshooting of Outlook

Error in opening attachments in outlook:

Ans:-You have to clear Outlook Secure Temp folder.

Outlook Secure Temp folder

Unfortunately this is easier said than done. The subfolder name Outlook creates (on installation of Outlook) in the Temporary Internet Files folder is quite random.
In Outlook 2003 and previous, the name starts with OLK and is followed by up to 4 random numbers or letters. In Outlook 2007, 2010 and 2013, this folder is called Content. Outlook and then has a subfolder which is named with with 8 random numbers and letters.
In addition, by default, you cannot simply browse to the folder to clean it out. Getting to the Temporary Outlook Folder can still be accomplished in 2 easy steps though.

Step 1: Locate the folder

The folder location is stored in the registry in the following key;

Outlook 97	HKEY_CURRENT_USER\Software\Microsoft\Office\8.0\Outlook\Security
Outlook 98	HKEY_CURRENT_USER\Software\Microsoft\Office\8.5\Outlook\Security
Outlook 2000	HKEY_CURRENT_USER\Software\Microsoft\Office\9.0\Outlook\Security
Outlook 2002/XP	HKEY_CURRENT_USER\Software\Microsoft\Office\10.0\Outlook\Security
Outlook 2003	HKEY_CURRENT_USER\Software\Microsoft\Office\11.0\Outlook\Security
Outlook 2007	,
Outlook 2010	HKEY_CURRENT_USER\Software\Microsoft\Office\14.0\Outlook\Security
Outlook 2013	HKEY_CURRENT_USER\Software\Microsoft\Office\15.0\Outlook\Security

Step 2: Get to the folder

1. Open the OutlookSecureTempFolder registry key from the location provided in Step 1.
2. Copy the path from the key.
3. Open Explorer
4. Paste the address in the Address Bar and press Enter then delete all files.