Error 1606: Could Not Access Network Location %APPDATA%\

I was installing Symantec Antivirus on one of the client machines today when it prompted me the error (noticed on Windows Vista). I then Bing'd it to find out that this issue appears when the Shell folder of the logged on user has incorrect entries.
It might be the case with any installation and not just Symantec. I recommend you to backup the registry before trying this out.
These are the steps to fix it:

1. Click Start > Run > regedit.exe
2. Locate the registry key: HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Explorer\User Shell Folders\
3. Delete the entry which shows the error message