You haven't much to complain about, with such low-end hardware:
The officially published requirements were wrong when announced, and commented on from the start.
Corrected Skyrim Minimum Requirements
* Windows 7/Vista/XP PC (32 or 64 bit)
* Processor: Dual Core 2.3 GHz
C2D or equivalent CPU
* 3GB System RAM
* 6GB free HDD Space
* Direct X 9 compliant video card with 512 MB of RAM
(and
sufficient performance to actually put that VRAM to use) * DirectX compatible sound card
* Internet access for Steam activation
The minimum video card actually able to do anything with 512 MBs of VRAM is an HD 4670, which is no longer easily found in its original version, so an HD 5570 is probably what you have to accept at a reasonable cost. The nVIDIA minimum for running 512 MBs properly is far too expensive in comparison.
If you give that puny graphics card room to breathe by lowering the screen resolution to something more appropriate for an entry level antique video card, you may be happier.