My skyrim game is so laggy?

I just Got Skyrim on my PC and it is super laggy, I have a Lenovo thinkpad t400 and yes i know it isn't the best laptop for running skyrim but i heard so many people who ran games like gta on crappier laptops so i thought i could run skyrim on mine. It works but its super laggy. I tried everything but i couldnt fix it. I tried pretty much tried everything on the skyrim.pref thingy. Any suggestions on how to fix it.

"Skyrim" wants…
- Windows 7/Vista/XP PC (32 or 64 bit)
- Quad-core Intel or AMD CPU processor
- 4GB System RAM
- 6GB free HDD (Hard disk drive) space
- 9.0c compatible NVIDIA or AMD ATI video card with 1GB RAM: Nvidia GeForce GTX 260 or higher; ATI Radeon HD 4890 or higher
- DirectX compatible sound card
- Internet access for Steam activation

Minimum System Requirements*
-Windows 7/Vista/XP PC (32 or 64 bit)
-Processor: Intel Dual Core 2.0GHz or equivalent processor (AMD Sempron @ 2.4 GHz)
-2GB System RAM
-6GB free HDD space
-Direct X 9.0c compliant video card with 512 MB of RAM
-DirectX compatible sound card
-Internet access for Steam activation
*Minimum Specs, sell games, but may not make for satisfying game play.