I purchased the game last night. I downloaded and installed with no errors or problems.

I created my char with no problems. but after logged in the game I experience horrible FPS (17-25 average). Turned shadows off, full screen mode, no anti allising and keep running with low fps.

Any Idea to help improve the fps?

I Play Starcraft 2 (Ultra settings), Mafia 2, Team Fortress 2, Medal of Honor, BF2, Call of Duty: Black Ops all with 50-60fps.

My Spec:
Sistema operacional Microsoft Windows 7 Ultimate
Service Pack do Sistema Operacional -
Internet Explorer 8.0.7600.16385
DirectX DirectX 10.1
Placa mãe:
Tipo de processador QuadCore Intel Core 2 Quad Q6600, 2400 MHz (9 x 267)
Nome da Placa Mãe Asus P5K SE (2 PCI, 3 PCI-E x1, 1 PCI-E x16, 4 DDR2 DIMM, Audio, Gigabit LAN)
Chipset da Placa Mãe Intel Bearlake P35
Memória do Sistema 3072 MB (DDR2-800 DDR2 SDRAM)
DIMM1: 1 GB DDR2-800 DDR2 SDRAM (5-5-5-15 @ 400 MHz) (4-4-3-10 @ 266 MHz) (3-3-3-8 @ 200 MHz)
DIMM3: Kingston 9905316-152.A00LF 2 GB DDR2-800 DDR2 SDRAM (6-6-6-18 @ 400 MHz) (5-5-5-15 @ 333 MHz) (4-4-4-12 @ 266 MHz)
Tipo de BIOS AMI (10/31/07)
Porta de comunicação Communications Port (COM1)

Monitor:
Adaptador gráfico ATI Radeon HD 4800 Series (1024 MB)
Adaptador gráfico ATI Radeon HD 4800 Series (1024 MB)
Acelerador 3D ATI Radeon HD 4870 (RV770)
Monitor LG W2252 (Digital) [22" LCD]