Answer for:

my computer keeps restarting

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disclose (best to do it at the start, so you don't forget to do it!):

(1) the manufacturer and the model number of the computer, especially if it is made by Dell, Hewlett Packard (HP), Sony, IBM, Apple, etc., and

(2) which operating system (e.g., which Windows?) and the most recent Service Pack (SP) that has been installed.

Then describe the problem, but begin by describing what you did with the computer recently BEFORE the problem began -- if you can identify anything in particular, for example: installed new software (or upgraded existing software), installed an external USB drive, plugged the computer's network adapter into a router, replaced the laptop's battery, tripped over the power cord, .....

RonK's surmise is probably correct; he offers good advice, although we are all shooting in the dark without knowing the hardware and the operating system (and version).

Spontaneous rebooting has been reported after Windows XP Service Pack 3 (SP3) was installed on a computer that has an AMD CPU, although that ordinarily does not happen if the CPU is an AMD Athlon XP (4 digits)+ model such as an Athlon XP 2400+.

Sometimes spontaneous rebooting is caused by updating hardware drivers, or by installing a new device such as a DVD R/W drive, with its manufacturer's drivers, which might be outdated. Oddly enough, Microsoft Windows drivers usually work instead, but might not give you use of all features of the hardware. If this seems to be the case, then you will probably have to boot into Windows Safe Mode and run Control Panel > System > Hardware Manager to troubleshoot and replace the driver(s).

Google this:

Windows XP spontaneous reboot

or Google this: XP spontaneous reboot

Be sure to read each page, to which there is a link in each result, completely, because references to other links that might be more helpful are often placed at the bottom, for example:

may solve your problem, or "How to repair Windows if you are unable to boot into Windows" can be helpful even if you can boot into Windows, because it tells you how to perform a "repair re-installation" of Windows XP.

Note: if your computer is not running "Windows XP" just substitute the OS and version for "Windows XP" in the above examples and advice.