HELP my pc keeps shutting down

Help my computer (window xp) keeps shutting down. it shuts down randomly. and when i on it straight after it shuts down, its shuts down just before windows loading screen then i have to wait 10 min before i can on it again. then goes to a screen where u can on it normally, safe mode, safe mode with network, or on before the program sometimes it will go blue screen and says checking C drive


At 1st i thought it was the temp so i put in another fan and now my fire icon read at GPU 54C, Temp 1 68C, Core 54c, core 54c the rest are blue arrows pointing down (temp 3 is -128C),
then i thought it might be dust so i clean it with conpressed air can. im also virus scan it
I think it can be a power problem is there anyway i can check if it is a power adapter problem without having to get a new power adapter or could the be another problem like some wires not in properly