I bought an new graphics card, still unable to run ultra

I know everything isn't about the graphics card, I'll be buying more RAM soon(trying to get ~4MB) aswell as upgrading to windows 7, but is there anything else I will have to do to run sc2 on ultra?

Dxdiag:

Spoiler

------------------
System Information
------------------
Time of this report: 10/10/2010, 12:28:51
Machine name: THEOVERMIND
Operating System: Windows XP Home Edition (5.1, Build 2600) Service Pack 2 (2600.xpsp_sp2_gdr.100216-1441)
Language: Swedish (Regional Setting: Swedish)
System Manufacturer: FUJITSU SIEMENS
System Model: MS-7125
BIOS: )Phoenix - Award WorkstationBIOS v6.00PG
Processor: AMD Athlon(tm) 64 X2 Dual Core Processor 4200+, MMX, 3DNow (2 CPUs), ~2.2GHz
Memory: 1536MB RAM
Page File: 851MB used, 2070MB available
Windows Dir: C:\WINDOWS
DirectX Version: DirectX 9.0c (4.09.0000.0904)
DX Setup Parameters: Not found
DxDiag Version: 5.03.2600.2180 32bit Unicode

---------------
Display Devices
---------------
Card name: ATI Radeon HD 5500 Series
Manufacturer: ATI Technologies Inc.
Chip type: ATI Radeon Graphics Processor (0x68DA)
DAC type: Internal DAC(400MHz)
Device Key: Enum\PCI\VEN_1002&DEV_68DA&SUBSYS_30801682&REV_00
Display Memory: 1024.0 MB
Current Mode: 1600 x 900 (32 bit) (60Hz)
Monitor: Plug and Play-bildskärm
Monitor Max Res: 1600,1200
Driver Name: ati2dvag.dll
Driver Version: 6.14.0010.7050 (English)
DDI Version: 9 (or higher)
Driver Attributes: Final Retail
Driver Date/Size: 1/14/2010 04:45:52, 301568 bytes
WHQL Logo'd: Yes
WHQL Date Stamp: n/a

 

There are a couple of Ultra settings that are processor-dependent - reflections and physics, I think. Not really sure if you can upgrade your CPU without swapping the motherboard. Besides, that HD5570 is somewhat borderline for Ultra.

 

This game is fairly processor intensive from what I've read on Tom's Hardware. My setup is this:
C2D E6750 @ 2.66 - stock clocks since my overclocking experience was not fantastic :[
4 GB DDR2 @ 800
GTX 460 768 MB @ 850/1900

And I can run the game no problem on ultra at 1920x1200.

I'd see if you could pop in a better processor and more ram without having to swap your mobo. For your resolution I'd think your GFX card would be close to good enough, but I could be an idiot.

Nice computer name btw

 

^
what makes it even cooler is that my laptop's name is Zasz

But yeah, I figured my processor needs swapping aswell, do you have anyone you reccommend that you know fits my motherboard?
also, I think i'll be buying an 1920x1200 or atleast an 1080p one.