Are .REG files associated with Nero, or are you still finding Nero references in the system registry? If it's the former you can change the file association for .reg files to regedt32.exe in C:\Windows\System32. If it is the latter I would run RegSeeker to clean out the obsolete entries.
Hope this helps,
I run Vista, installed Nero Pro and it changed the default of the registry for all media files. Now when I open IE7 normal websites run fine, but it's impossible to run streaming audio or video.
I uninstalled Nero, but the reg has not changed. I don't know enough about windows/computers to start manually typing in the registry.
I made Windows Media Player and Media Center the new defaults for media files, but the reg still reads "Nero".
Someone please help!