ATX or MICRO-ATX powers supply for my case?

Solution
What do you mean "fix a ATX power supply?" A good tinkerer could, but you'll probably pay far more than the power supply is worth, especially if it's an OEM one, which tend to be on the junky side.
Yes you should be able to fit an ATX PSU in this computer ( I think you meant 'fit' not 'fix') as if you read the description it is described as a 'full desktop' which probably means it is not a small case