Problem Loading Explorer.exe at Startup

Hi,
After turning on my pc each time I try to log into my user account and then just the picture and registry key shown in the box.
Task manager needs to be opened and new task also needs to be selected for the load of Explorer.exe.
I have been confirmed by my computer that only 3% disk space is being used but the problem is pc is very slow.
Can you tell what is it going on there?
Thank you for your help on this one.
