Outlook 2010 - User receiving error while attempting to open attachment

User receiving error message while attempting to open a .jpg from email (Outlook 2010)

Can’t create file: filename. Right-click the folder you want to create the file in, and then click Properties on the shortcut menu to check your permissions for the folder. 

CAUSE: 

• This indicates that the Temporarily Internet Files folder has reached the storage limitations.

SOLUTION: 

From regedit, navigate to:

• HKEY_CURRENT_USER > Software > Microsoft > Office > 14.0 > Outlook > Security to find OutlookSecureTempFolder.
• Copy the path under Value Data.
• Open My Computer and paste the value in the address bar.
• Delete some, or all  files from this location.
• Close Outlook and re-launch.
• You should be able to open attachments at this point.