Assassin's Creed Brotherhood problem

[Thaer]

Hello,
My assassin's creed brotherhood is very slow, I even can't pass some missions because of this problem. Anyone can help me?

My system:
Windows 7, 32 bit
2 GB RAM
DirectX: 11

Display:
ATI Radeon HD 4300/4500 Series.
Chip type: ATI display adapter (0x954F)
Graphics memory: 1274 MB
Display mode: 1680 x 1050 (32bit) (59Hz)
Monitor: Generic PnP Monitor

Sound:
Speakers (Realtek high definition audio)
Type: WDM
Product ID: 1
Default Device: No

Drivers:
RTKVHDA.sys
Version: 6.00.0001.6954 (English)

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Second question: My system information doesn't appear in dxdiag, it appears like this: http://i.imgur.com/4W77lCC.png How can I solve that?

[Calum]

Your graphics card isn't up to the task, to put it simply.
Download and run Speccy and attach a report to your next post, that'll give us some more in depth information about your PC and we can go from there.

[Thaer]

Your graphics card isn't up to the task, to put it simply.
Download and run Speccy and attach a report to your next post, that'll give us some more in depth information about your PC and we can go from there.

Isn't there any possible method to solve it?

[Calum]

Isn't there any possible method to solve it?

Download and run Speccy and attach a report to your next post, that'll give us some more in depth information about your PC and we can go from there.

[Thaer]

Could you tell me what you need to know?