Just a little question if you know as I might want to replace the MB with the PSU. my question is, if I will get a new MB instead, will I HAVE to reinstall windows? because if I need to, I should backup my files before I go to the store

There is really no problem with the motherboard, it's the PSU. Personally I say buy a new one.

I'm going to replace the PSU with a new one under warrenty but unfortunately I have spent enough money on the PC so I can't efford another PSU at the moment. hopefully the new one I get will be better.

The motherboard I want to replace is because it could have a bad socket that is causing the CPU to look as if it has high temp. hopefully a new one will read the temps and voltages right. I just hope they wouldnt hold it for "repair" for a long time before I can get my PC back.

Well I got the PC back from the store, basically they did nothing to actually check whats wrong. I replaced the PSU for an Antec TruePower II 480W one and I wanted them to check with a volt device what are the actual +5V volts is and if the program are accurate or wrong but they didnt. I also wanted them to check if the CPU is overheating or maybe its the sensors on the motherboard not working properly but what do you know, they didnt even bother to switch motherboards to check if its the sensors or not. the guy simply said on one hand dont rely on the programs and only trust what the BIOS says but on the other hand he based his so called "tests" on those programs. pretty stupid I would say. I gave them to run real tests and not use my programs which I can do on my own here, I dont need them for that. and they had the nerve to tell me next time if I bring them to check and nothing is wrong they will charge me. I told them if I have a problem with my PC I will bring them to check and I won't pay a cent as long as its under warrenty.

The temp at 70 C is both the cores temps. The other one is the CPU temp wich is located above one of the cores, so it only reads out around 30-40C. (only reading one core) wich is the temp you should work off. The cores temp is illrelevent.

So what you're saying is that I should only look at the 30+C read if I want to know if the CPU is overheating?

Yep, aslong as it doesn't go over 55c you should be good.

Thank you CrossFire851, I will keep my eye on that reading only