Computer is shutting off when im on it y is this going on

We need to know which Operative System are you using to give you an exact answer how to do it.

these posts are endless here, truely
had to google it ah a DESKTOP
old Pentium 4 processor
circa 2003 , tiny HDD, and memory. old, Goodwill has 1000s parked.

well it can be many things,
did you remove all the cards first, (yes all)
does that hold up power? now?
it will beep, like that, if video car is pulled
and then pull memory, and it will give the ram missing beep codes
all this is covered in the great HP service books.,
beep codes and all
the power switch can be bad or the line cord. to wall. bad.
the power switch unplugs and you can short its 2 pins
to turn on PC< hold up now>?
hold up, means stay running,

you can strip it down, to just mobo and PSU
sure can,.
the CPU can overheat, sure can. and can be checked.
cpu fan works so is not that. im sure. and new thermal grease.

data sheet shows. (pull it,?)
nVidia GeForce4
GeForce4 MX
MX
440 440 AGP
AGP 8x
8x graphics
graphics card
card

Reboot essentially means restarting the computer. This is two types
1. Warm Reboot: where you go to start on windows task bar and choose shut down but when prompted choose restart. This way computer shuts down momentarily and restarts!
2. Cold Reboot: By this means you choose to shut down and again when prompted choose shut down! This makes computer off completely until restart by pressing power button.
Booting is computer Lingo for above procedures!

It can be virus problem. Try to go in 'Safe mode with networking' (press few times F8 when computer start to get menu options). Download ESET (Nod32) Online Scanner:
http://go.eset.com/us/online-scanner
Scan your computer with repair option on.
After that update your Windows. If you can't do that from Microsoft, you can use AutoPatcher.exe utility:
http://www.autopatcher.com/downloads/
I don't think it is keyboard problem.
You have free AVG good antivirus for homeusers.
Good luck!

It sounds like you have not installed the chipset driver. Find your cd that came with the pc and install the chipset driver or go on line and download the latest driver.

All the user profiles are corrupted - some installed program that should be launched during boot is incompatible with Win 7.
Since you don't know which program and the extent of the corruption all you can do is to reinstall Windows and then install all the programs back, one at a time - when the problem returns you will know that the last program is bad, get rid of it.

From the top of the glass,don't forget close the door or cover of the glass before you make a copy of your xerox.

well at least youre honest and im not too sure if anybody here can help you because most email probs are caused by username or password problems and im sure you dont wanna hand those out. im sure if you ring your internet provider they will talk you through all the settings and all should be good. If they wont maybe you need to trust somebody like me and i have no interest in others emails so call me anytime ok i'll sort it out for you. cheers and plz vote

I believe the relay is on fire wall in center or on drivers side it will be w/ 1 or 2 other relays they usely are the same . not gospel.. 1, is fuel pump..it will click w/ u turn on the key to start poss. u can feel it & hear it .Some .auto parts stores may check this for You...

Sounds like spyware / malware i would use an online scanner like Eset or a program like Malwarebytes.

also to stop the computer from restarting open the command prompt window (start menu, click run, type cmd, click ok...) type "shutdown.exe /a" without the "" and there is a space between exe and /a this will abort the shutdown.