Windows 7: Sudden complete lock up

The computer has been locking up
- does not respond to keyboard for a couple of minutes and mouse can't move. Delayed response to keyboards presses.
Happens on starting IE window or sometimes during playing Youtube video.
Windows 7 Home Premium (Japanese version)
OEM

Hi cloa513 and welcome to SF.
Please download Malwarebytes and run a FULL scan and post the results of scan for us.
Thanks

Did that- it found no malware.

I did the flagged windows updates and actions- no real idea what they were but one was the Win defender action.

Have you tried doing a System Restore ?
If you have no luck with that you may need to do a Repair Install assuming you have your Windows 7 installation disk. If one of these methods doesn't help please let us know and we'll try another route.

Thanks for all your replies but too difficult to do as its Japanese Version Windows 7 and I don't read Japanese well enough or know Windows 7 well enough to work me my way to system restore. If there is a detailed pictural that would be fantastic. Anyway not really happened again

There IS a pictoral in the link- System Restore
You may try a Japanese to English translator. Japanese to English Translation
Hope this helps.

Seems like its been resolved by uninstalling some security software- McaFee perhaps. Thanks anyway.