PC Upgrade help, please?

the psu is probs too much the gpu will be fine i think you only need like 620w if you plan to add another gpu in the future but you probs won't use more than 450w (i think)

I agree with jakeanaitor. Unless your are gonna use another gpu you should stick to 450 - 500w range.

Switch the graphics card to this one

And power supply to either this or this

switch cup to intel i5 o i7

The CPU you have is a APU meaning it was made to focus on the integrated graphics. It might bottleneck your performance as it does not do well in multiprocessing. i3 processors will beat it. Just an FYI on you current comp.

If you want to upgrade your CPU on your current mobo, i would get This
Just make sure your current BIOS can properly support it. you may need to update the BIOS otherwise. (does not require reinstall of windows)

Do not update your oem pc because i will break your warranty........Sell it and make a PC by yourself.

I recommend to buy a graphics card AMD Radeon R9 280x, which significantly outperforms the GTX760, at equal cost.

That psu is overkill. A 500-600w one will do the job just fine. Make sure its 80+ rated.
Note that this graphics card will be heavily bottle-necked by your weak CPU. You should either save some more money for a full CPU + Mobo + GPU + PSU update, or just get a cheaper Graphics card like a 7870.

I recommend starting from scratch.
But if you don't want that, that PSU is horrible, get an Antec, Corsair or Seasonic.