Minimum specs for your PC are Windows Vista/7, 4GB of RAM, and a DirectX 9.0c compatible NVIDIA or AMD ATI video card with at least 1 GB of RAM with fully updated drivers. This free DLC takes care of some of that. When the game was released last year, one of the few criticisms was that gamers with powerful PCs couldn't take advantage of all their extra resources. If you own the game and your PC exceeds the recommended specifications, you'll be able to use The Elder Scrolls V: Skyrim High Resolution Texture Pack.
The Elder Scrolls V: Skyrim High Resolution Texture Pack is a free download pack that makes Skyrimlook even better.