New keyboard and mouse.

Um, err, could you be plugging them vice versa?

As forumdude123 suggested, did you try running cmd as admin?

Right click and select "Run as administrator".

There is a tweaker I know that can achieve ten second boots but his methods are way above the norm.

See post No 19 at this Link (http://www.bold-fortune.com/forums/index.php?showtopic=3149)

For cleaning up infected machines I use Dr Webb's Cureit, Kaspersky, SuperAntispyware, RogueRemover, Hijackthis and Runscanner.

On my own machines I prefer sandboxing/virtualisation with no...

It can only be a virus and or or corruption!

Can you post a screenie of running processes.

Check in event viewer for any error messages relative to the restarts.

Also right click my computer - properties - Advanced tab - Startup and Recovery Settings - and untick under System Failure -...

You will have to go to PC store to see if it can be replaced.If not then a new unit will be needed.

Shouldn't be too expensive and don't forget the heatsink paste.

The broken clip you mentioned.

If it is a clip that belongs to the heatsink which clamps it firmly on to the cpu then it is an overheating problem.

Check in services that Windows Image Acquisition (WIA) service is set to at least manual.

Go run and type services.msc.

You could use Agent Ransack, a free search utility, to find then manually delete any files/folders remaining of uninstalled apps.

Regseeker has a nice registry search function that will find and...

Have you tried a scan with SuperAntispyware?

SuperAntispyware (http://www.superantispyware.com/)