This is unusual, but it sounds like there is a bug in regedit (and regedit32) which prevents the displaying of unusually long registry keys. Now, that sounds innocent enough, it also prevents the viewing of keys entered under them. Again, ok not a crisis. Imagine if you had an extremely long registry key entered in the ….software/microsoft/windows/currentversion/run area? Annoying maybe? Ok, what if it were put there by malware? Oooooooh… that would be bad….