for some weird reason my computer keeps shutting down for no reason, any idea why this is happening?

What exactly happens? Does the computer power off? Does it reboot? Does it Blue Screen? Is there an error message?

Is this a new problem? Any new hardware or software?

well for no reason it will either reboot or just switch off on me, i thought it was a problem related to software but it does it even when no programs are running and just explorer is open, not sure on blue screen as that isnt on, no error messages, fairly recent problem but am sure that no new hardware or software has been added, other than a new ram stick but problem pre-existed

First off I would run the manufacturer's diagnostic on your hard drive.

If you do not know the manufacturer look in the Device Manager under Disk drives.

Device Manager = right click My Computer then click Manage then Device Manager

how does one run the manufacturers diagnostic? i find the place you mean but running diagnostics?

Who is the manufacturer? What is listed?

WINXPHOMEPREINS , ACPI Uniprocessor PC, another thing i just found bizzare is the hardware scan, ive used it before and now no info comes up, that is the hardware scan on this site, i think im in trouble

The scan on this site is Out of Order

If you click the + next to Disk drives you see what you posted?

WINXPHOMEPREINS , ACPI Uniprocessor PC

ACPI come out after clicking the + on computer, WINXPHO... is right at the top, the very first one

sorry, disk drives i see WDC WD800BB-00JHA0