It stays on saying “shutting down” for about 10 mins then it restarts saying it has recovered from a severe error.
The on the web report states it is a blue screen error-any advice please.many many thanks
ps ive done the usual checks,safe mode etc but still no luck.

Answer:
What 'Reiatsu' wrote may work. Before you try that you could try:

Run Antivirus scan and malware scan.

Then download ccleaner (ccleaner.com). Run the “Registry” scan and fix all the issues it throws up, but run this a few times until you either have no errors or just the same 2 or 3 are showing up.

This doesn't always work but its 50/50…I've seen this problem a few time in work and this has solved it before.

Answer:
(If the PC runs OK apart from not being able to shutdown i.e. run the shutdown program (???))

You can try just reinstalling the windows files by:

Click Start and Run and then type “cmd” and hit enter (brings up command editor window with dos prompt)

Type: “FIXMBR” at the prompt and hit enter, let that run and see if that works with a restart and then try to shutdown as normal

If that fails go back to the CMD command prompt again and type: “FIXBOOT C:” hit enter and let that run.

Both the above reinstall ONLY certain windows boot/shutdown files so you might get away without having to reformat etc

Answer:
I understand whats going on, its most likely that there’s something wrong with the processor, so I recommend that you bring it the a personal company to have them take a look at it. I always bring my personal to Geek Squad at BestBuy, they're great. Hope I helped!
Answer:
You might need to back up your files & reformat. Either send files to yourself via email, or burn disks, or use an external hard drive if you’ve one. A virus might well have removed a file command necessary to shut down.