Clean the PC case and heatsink of all fluff and dust, there will be a layer of fluff trapped between the cpu fan and heat sink which means you will need to renove the fan from the heatsink to get rid of it.
DDR2 333 x 2? do you mean 2G of ram more RAM will make a difference but if you run a 32bit system then windows can only access about 3.5G of a 4g sick. May be worth running memtest to check the RAm you have is not faulty
The Legend of Zelda Breath of the Wild review: Five hours with Zelda on the Nintendo Switch