If I go to Set your default programs, there is nothing in the list!
I've discovered that this is a bug in Nokia Video Manager installer.
To fix it, I saved the following from a working PC, as "NokiaVMFix.reg"
---- INCLUDE TEXT BELOW ----
Windows Registry Editor Version 5.00
[HKEY_LOCAL_MACHINE\SOFTWARE\RegisteredApplications]
"Windows Address Book"="Software\\Clients\\Contacts\\Address
Book\\Capabilities"
"Internet Explorer"="SOFTWARE\\Microsoft\\Internet Explorer\\Capabilities"
"Windows Mail (News)"="Software\\Clients\\News\\Windows Mail\\Capabilities"
"Windows Media Player"="Software\\Clients\\Media\\Windows Media
Player\\Capabilities"
"Windows Photo Gallery Viewer"="Software\\Microsoft\\Windows Photo
Gallery\\Capabilities"
"Windows Media Center"="Software\\Clients\\Media\\Windows Media
Center\\Capabilities"
"Windows Mail"="Software\\Clients\\Mail\\Windows Mail\\Capabilities"
"Windows Calendar"="Software\\Clients\\Calendar\\Windows
Calendar\\Capabilities"
"Windows Search"="Software\\Microsoft\\Windows Search\\Capabilities"
"QuickTime"="SOFTWARE\\Clients\\Media\\QuickTime\\Capabilities"
"iTunes"="Software\\Clients\\Media\\iTunes\\Capabilities"
@=""
---- INCLUDE TEXT ABOVE ----