|At the taskmanager -> File -> Run -> explorer.exe (hit enter)|
If that still doesn't work, or the problem repeats, your startup is maybe full with other programs, and trying to starting up..
At the taskmanager -> File -> Run -> msconfig (hit enter) -> Startup
DO ONLY CHECK PROGRAMS OUT THAT YOU KNOW BY NAME, LIKE msnmsgr.exe (MSN) , OTHERWISE IT COULD BE A IMPORTANT SYSTEM SERVICE\PROGRAM.
Happy is ONE who says I am an OttoMAN.