[John Rogers]

You might try starting it in "safe mode" to see what happens. Sometimes Windows will not start up completely if it is trying to do OS updates if they have not been done in a while or other words the Windows takes control away from you.

If you want to try this it might also work. Try starting and let it sit a while then do ctrl-alt-del and start the task manager. Look to see if "Windows Explorer" is running in the "processes" column. If not then select file -> run new task and select Windows Explorer. I think the OS can't read you directory named "Desktop" on your "C" drive under your user ID?