Computer Freezing at Logon [Anwsered]

Computer Freezing at Logon

Hello,
My computer for some reason has started going crazy.
When I log on, I have a black screen with moveable cursor.
This implies that Explorer isn't starting properly.
I end up having to enter Task Manager, terminating Explorer in the Processes list (which also
has a static memory usage - sticks at around 14,587k) and starting as a new task.
Because the main user of the machine was getting angry, I set up a scheduled task to do this automatically, but that got me the black screen, cursor and the taskeng.exe window
that sat with the flashing underscore.
After I do get Explorer running, I can't run any programs and I notice that the network icon in the system tray has grey wireless bars and a frozen Aero Busy spinner.
In about ten minutes time the icon is the wireless icon with 5 bars as it should.
Up until a few weeks ago, the icon would go from the frozen icon to the 'Connections Available' icon (with the yellow star), even though it was connected.
I thought that it may be something at startup, because the system works normally in Safe Mode, Safe
Mode with Networking, Safe Mode with Command Prompt, Diagnostic Startup, and under a Clean Boot.
With that theory, I disabled all the Startup processes that weren't Microsoft or network drivers.
When I restarted in normal mode, my Aero turned to Windows Classic
- unchangeable, and now Network Troubleshooting reports that there is a DNS error.
Network and Sharing Center tells me I have local only connection, but when I ping in command prompt to a local IP, I get a General Failure.
I have tried ipconfig /flushdns
several times to no effect.
Thanks in advance,

Luke 
* = The crossed out section is not applicable any more, but I still left it in.

Original title: Computer Freezing at Logon
Threads merged.
Duplicate deleted.

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