Okay, riddle me this one.

I just installed a bunch of new software (Nokia PC Suite, etc.) to make my new Nokia 5100 phone work with my desktop. Now, when I try to open up a generic Windows Explorer (C:\WINDOWS\explorer.exe), nothing happens. If I bring up a shell window (either bash or generic MS-DOS) and try to run it by hand, I just get back another command prompt and nothing else happens.

However, I can double-click on "My Network Places" and the right window pops up, which I can then redirect wherever else. Checking the task manager, I currently have two instances of explorer.exe happily running, and I have two such windows on my screen (both opened in the same backward fashion).

What, pray tell, could have possibly broken?