pc self-rebooting

my pc is self-rebooting whenever I open something that requires higher cpu usage. I can play ET for around 2-3 minutes tops until it reboots again. I checked my cpu temperature using speedfan and it runs at around 42-43 degrees. is it really that abnormal since I had more than 40 on my old pc and never had any problems.

my cpu usage is actually really low even when I have loaded ET. what is more, I have already been to the repairs and had my fan exchanged, but it seems to me that it has got only worse. so, could it be caused by the overheating, and if it is, is there some way to make my fan run faster?
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13
Welcome to the wonderful world of the Microsoft Cooperation!
My pc reboots when i try to disconnect my internet through the little icon in the taskbar xF
you shouldnt disconnect your internet
Parent
i knowsss but also happens when i press Repair!
Parent
i think it's something completly different.

reboot, then press F8 after the bios boot picture and BEFORE the winxp loader picture.

there choose that winxp will NOT automatically reboot on system failures or such.
now you will see the bluescreen and know what is causing the mess as soon as your pc fails again.
What kuraigu said, i had a similar problem before
welcomme to hackers heaven =)
Had the same problems, cant remeber what i did to solve it.

:(
i had this 2-3 years ago it turned out to be a dodgy psu, check ur bios and make sure voltages are all fine.
put it in your
image: Basket-40_g
SO HELPFUL!
Parent
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