Ok I've made some progress. Appears to be a problem originally from a GPO setting. "Turn on Classic Shell" under User Config/Admin Templates/Windows Components/Windows Explorer causes this problem and is now set to disabled. My second issue is that the users have retained the settings in their profiles. I've managed to fix double click by adding the following to the registry via GPO:
Windows Registry Editor Version 5.00
[HKEY_CLASSES_ROOT\Directory\shell]
@="none"
To fix the new window issue I've found a reg hack below:
Windows Registry Editor Version 5.00
[HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Explorer]
"ShellState"=hex:24,00,00,00,37,20,00,00,00,00,00,00,00,00,00,00,00,00,00,00,\
01,00,00,00,12,00,00,00,00,00,00,00,22,00,00,00
"IconUnderline"=dword:00000002
[HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Explorer]
"ShellState"=-
"IconUnderline"=dword:00000002
Trouble is that the current user bit won't run via Group Policy. I'm guessing that it needs administrator access to run it as the users don't have access to regedit. Is there a way I can do this in GPO?
Other option is that I delete their roaming profiles and local profiles off the machine but that's really a last resort. If I can avoid that it'd be great.