Can i found capacitors that needed for using atemega standalone in a PC desktop power supply 450W
There is a good chance. The decoupling capacitors don't need to be exactly 0.1 uF. Anything in the ballpark of 0.1 uF will be sufficient.
The values of the crystal oscillator load capacitors also don't need to be exactly 22 pF. I'm not sure if you will find suitable values for the crystal oscillator load capacitors in a power supply though. However, keep in mind that you can use an ATmega328P without a crystal as long as you have configured the fuses on the chip so that it will use its internal oscillator (which will be the case for a chip fresh from the factory, but not for a chip off an Arduino board).
That means if I didnt use crystal oscillitor i didint need to use any type of capacitors
That is incorrect. You should add the decoupling capacitors, as shown here in the tutorial:
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Thanks