reboots without notice

I would like to fix the problem, that my computer reboots without notice.

Hi, Sorry to hear of the problem with your computer rebooting itself. Can you supply some more information? ie: 1 Is there a correlation between rebooting and a particular range of activities? 2 When did it start? 3 What hardware or software alterations have been effected since the start of the rebooting? 4 What does your event log show at the time of reboot? 5 Have you checked all your electrical connections, UPS, or if applicable laptop power supply/battery 6 When your machine reboots does it automatically run a system verification Chkdsk or scandisk? 7 Have you an efficient two way software firewall running with updated antivirus and antispyware? 8 What do the latest logfiles from these scans show? 9 Have you tried an online virus scanner…Panda, Trend etc? 10 Are you receiving specific error messages? If so details please. The answers to the above will help us make a start on providing you with some assistance Regards paws