The HD 5750 and GTS 450 draws too much power than your 220w PSU (power supply) can provide; the GTS uses more power than the HD 5750. Attempting to run either of the two cards can cause the PSU to overload sooner rather than later. An overload can also damage at least one component in your PC and if you are unlucky, it will destroy your entire PC.
Unless you upgrade the PSU you are stuck with the HD 5570. I wouldn't even recommend a HD 5670.